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Finding the Fourth Proportional to 685,045.96, 945,132.98 and 398,330.26

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Solution

The fourth proportional to 685,045.96, 945,132.98 and 398,330.26 is: 549,561.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,045.96 : 945,132.98 = 398,330.26 : x
  2. Step 2: Convert to fraction form
    685,045.96/945,132.98 = 398,330.26/x
  3. Step 3: Cross multiply
    685,045.96x = 945,132.98 × 398,330.26
  4. Step 4: Simplify right side
    685,045.96x = 376,475,061,303.49
  5. Step 5: Solve for x
    x = 376,475,061,303.49/685,045.96
  6. Step 6: Final answer
    x = 549,561.76

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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.