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Finding the Fourth Proportional to 726.85, 1,002.39 and 478.08

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Solution

The fourth proportional to 726.85, 1,002.39 and 478.08 is: 659.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.85 : 1,002.39 = 478.08 : x
  2. Step 2: Convert to fraction form
    726.85/1,002.39 = 478.08/x
  3. Step 3: Cross multiply
    726.85x = 1,002.39 × 478.08
  4. Step 4: Simplify right side
    726.85x = 479,222.61
  5. Step 5: Solve for x
    x = 479,222.61/726.85
  6. Step 6: Final answer
    x = 659.31

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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.