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Finding the Fourth Proportional to 729.16, 1,006.02 and 418.66

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Solution

The fourth proportional to 729.16, 1,006.02 and 418.66 is: 577.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.16 : 1,006.02 = 418.66 : x
  2. Step 2: Convert to fraction form
    729.16/1,006.02 = 418.66/x
  3. Step 3: Cross multiply
    729.16x = 1,006.02 × 418.66
  4. Step 4: Simplify right side
    729.16x = 421,180.33
  5. Step 5: Solve for x
    x = 421,180.33/729.16
  6. Step 6: Final answer
    x = 577.62

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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.