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Finding the Fourth Proportional to 726.60, 1,005.30 and 615.72

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Solution

The fourth proportional to 726.60, 1,005.30 and 615.72 is: 851.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.60 : 1,005.30 = 615.72 : x
  2. Step 2: Convert to fraction form
    726.60/1,005.30 = 615.72/x
  3. Step 3: Cross multiply
    726.60x = 1,005.30 × 615.72
  4. Step 4: Simplify right side
    726.60x = 618,983.32
  5. Step 5: Solve for x
    x = 618,983.32/726.60
  6. Step 6: Final answer
    x = 851.89

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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.