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Finding the Fourth Proportional to 531.90, 796.15 and 385.15

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Solution

The fourth proportional to 531.90, 796.15 and 385.15 is: 576.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.90 : 796.15 = 385.15 : x
  2. Step 2: Convert to fraction form
    531.90/796.15 = 385.15/x
  3. Step 3: Cross multiply
    531.90x = 796.15 × 385.15
  4. Step 4: Simplify right side
    531.90x = 306,637.17
  5. Step 5: Solve for x
    x = 306,637.17/531.90
  6. Step 6: Final answer
    x = 576.49

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.