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Finding the Fourth Proportional to 578.20, 865.14 and 440.76

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Solution

The fourth proportional to 578.20, 865.14 and 440.76 is: 659.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.20 : 865.14 = 440.76 : x
  2. Step 2: Convert to fraction form
    578.20/865.14 = 440.76/x
  3. Step 3: Cross multiply
    578.20x = 865.14 × 440.76
  4. Step 4: Simplify right side
    578.20x = 381,319.11
  5. Step 5: Solve for x
    x = 381,319.11/578.20
  6. Step 6: Final answer
    x = 659.49

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Half scale
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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.