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Finding the Fourth Proportional to 726.13, 1,002.05 and 415.69

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Solution

The fourth proportional to 726.13, 1,002.05 and 415.69 is: 573.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.13 : 1,002.05 = 415.69 : x
  2. Step 2: Convert to fraction form
    726.13/1,002.05 = 415.69/x
  3. Step 3: Cross multiply
    726.13x = 1,002.05 × 415.69
  4. Step 4: Simplify right side
    726.13x = 416,542.16
  5. Step 5: Solve for x
    x = 416,542.16/726.13
  6. Step 6: Final answer
    x = 573.65

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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.