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Finding the Fourth Proportional to 531.74, 797.88 and 491.78

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Solution

The fourth proportional to 531.74, 797.88 and 491.78 is: 737.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.74 : 797.88 = 491.78 : x
  2. Step 2: Convert to fraction form
    531.74/797.88 = 491.78/x
  3. Step 3: Cross multiply
    531.74x = 797.88 × 491.78
  4. Step 4: Simplify right side
    531.74x = 392,381.43
  5. Step 5: Solve for x
    x = 392,381.43/531.74
  6. Step 6: Final answer
    x = 737.92

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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.