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Finding the Fourth Proportional to 531.92, 797.28 and 257.39

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Solution

The fourth proportional to 531.92, 797.28 and 257.39 is: 385.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.92 : 797.28 = 257.39 : x
  2. Step 2: Convert to fraction form
    531.92/797.28 = 257.39/x
  3. Step 3: Cross multiply
    531.92x = 797.28 × 257.39
  4. Step 4: Simplify right side
    531.92x = 205,211.90
  5. Step 5: Solve for x
    x = 205,211.90/531.92
  6. Step 6: Final answer
    x = 385.79

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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.