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Finding the Fourth Proportional to 685,272.76, 945,665.18 and 379,342.74

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Solution

The fourth proportional to 685,272.76, 945,665.18 and 379,342.74 is: 523,486.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,272.76 : 945,665.18 = 379,342.74 : x
  2. Step 2: Convert to fraction form
    685,272.76/945,665.18 = 379,342.74/x
  3. Step 3: Cross multiply
    685,272.76x = 945,665.18 × 379,342.74
  4. Step 4: Simplify right side
    685,272.76x = 358,731,223,575.86
  5. Step 5: Solve for x
    x = 358,731,223,575.86/685,272.76
  6. Step 6: Final answer
    x = 523,486.77

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.