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Finding the Fourth Proportional to 729.24, 1,006.40 and 418.76

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Solution

The fourth proportional to 729.24, 1,006.40 and 418.76 is: 577.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.24 : 1,006.40 = 418.76 : x
  2. Step 2: Convert to fraction form
    729.24/1,006.40 = 418.76/x
  3. Step 3: Cross multiply
    729.24x = 1,006.40 × 418.76
  4. Step 4: Simplify right side
    729.24x = 421,440.06
  5. Step 5: Solve for x
    x = 421,440.06/729.24
  6. Step 6: Final answer
    x = 577.92

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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.