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Finding the Fourth Proportional to 729.90, 1,007.68 and 563.78

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Solution

The fourth proportional to 729.90, 1,007.68 and 563.78 is: 778.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.90 : 1,007.68 = 563.78 : x
  2. Step 2: Convert to fraction form
    729.90/1,007.68 = 563.78/x
  3. Step 3: Cross multiply
    729.90x = 1,007.68 × 563.78
  4. Step 4: Simplify right side
    729.90x = 568,109.83
  5. Step 5: Solve for x
    x = 568,109.83/729.90
  6. Step 6: Final answer
    x = 778.34

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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.