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Finding the Fourth Proportional to 729.61, 1,006.92 and 415.00

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Solution

The fourth proportional to 729.61, 1,006.92 and 415.00 is: 572.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.61 : 1,006.92 = 415.00 : x
  2. Step 2: Convert to fraction form
    729.61/1,006.92 = 415.00/x
  3. Step 3: Cross multiply
    729.61x = 1,006.92 × 415.00
  4. Step 4: Simplify right side
    729.61x = 417,873.06
  5. Step 5: Solve for x
    x = 417,873.06/729.61
  6. Step 6: Final answer
    x = 572.74

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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.