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Finding the Fourth Proportional to 729.96, 1,007.36 and 415.20

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Solution

The fourth proportional to 729.96, 1,007.36 and 415.20 is: 572.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.96 : 1,007.36 = 415.20 : x
  2. Step 2: Convert to fraction form
    729.96/1,007.36 = 415.20/x
  3. Step 3: Cross multiply
    729.96x = 1,007.36 × 415.20
  4. Step 4: Simplify right side
    729.96x = 418,255.87
  5. Step 5: Solve for x
    x = 418,255.87/729.96
  6. Step 6: Final answer
    x = 572.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.