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Finding the Fourth Proportional to 726.11, 1,002.05 and 415.61

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Solution

The fourth proportional to 726.11, 1,002.05 and 415.61 is: 573.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.11 : 1,002.05 = 415.61 : x
  2. Step 2: Convert to fraction form
    726.11/1,002.05 = 415.61/x
  3. Step 3: Cross multiply
    726.11x = 1,002.05 × 415.61
  4. Step 4: Simplify right side
    726.11x = 416,459.92
  5. Step 5: Solve for x
    x = 416,459.92/726.11
  6. Step 6: Final answer
    x = 573.55

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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.