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Finding the Fourth Proportional to 726.90, 1,003.14 and 412.15

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Solution

The fourth proportional to 726.90, 1,003.14 and 412.15 is: 568.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.90 : 1,003.14 = 412.15 : x
  2. Step 2: Convert to fraction form
    726.90/1,003.14 = 412.15/x
  3. Step 3: Cross multiply
    726.90x = 1,003.14 × 412.15
  4. Step 4: Simplify right side
    726.90x = 413,445.40
  5. Step 5: Solve for x
    x = 413,445.40/726.90
  6. Step 6: Final answer
    x = 568.78

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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.