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Finding the Fourth Proportional to 728.49, 1,006.11 and 634.80

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Solution

The fourth proportional to 728.49, 1,006.11 and 634.80 is: 876.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.49 : 1,006.11 = 634.80 : x
  2. Step 2: Convert to fraction form
    728.49/1,006.11 = 634.80/x
  3. Step 3: Cross multiply
    728.49x = 1,006.11 × 634.80
  4. Step 4: Simplify right side
    728.49x = 638,678.63
  5. Step 5: Solve for x
    x = 638,678.63/728.49
  6. Step 6: Final answer
    x = 876.72

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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.