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Finding the Fourth Proportional to 613.92, 921.21 and 477.24

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Solution

The fourth proportional to 613.92, 921.21 and 477.24 is: 716.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.92 : 921.21 = 477.24 : x
  2. Step 2: Convert to fraction form
    613.92/921.21 = 477.24/x
  3. Step 3: Cross multiply
    613.92x = 921.21 × 477.24
  4. Step 4: Simplify right side
    613.92x = 439,638.26
  5. Step 5: Solve for x
    x = 439,638.26/613.92
  6. Step 6: Final answer
    x = 716.12

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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.