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Finding the Fourth Proportional to 726.60, 1,002.78 and 478.07

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Solution

The fourth proportional to 726.60, 1,002.78 and 478.07 is: 659.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.60 : 1,002.78 = 478.07 : x
  2. Step 2: Convert to fraction form
    726.60/1,002.78 = 478.07/x
  3. Step 3: Cross multiply
    726.60x = 1,002.78 × 478.07
  4. Step 4: Simplify right side
    726.60x = 479,394.02
  5. Step 5: Solve for x
    x = 479,394.02/726.60
  6. Step 6: Final answer
    x = 659.78

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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.