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Finding the Fourth Proportional to 729.31, 1,005.78 and 563.26

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Solution

The fourth proportional to 729.31, 1,005.78 and 563.26 is: 776.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.31 : 1,005.78 = 563.26 : x
  2. Step 2: Convert to fraction form
    729.31/1,005.78 = 563.26/x
  3. Step 3: Cross multiply
    729.31x = 1,005.78 × 563.26
  4. Step 4: Simplify right side
    729.31x = 566,515.64
  5. Step 5: Solve for x
    x = 566,515.64/729.31
  6. Step 6: Final answer
    x = 776.78

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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.