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Finding the Fourth Proportional to 922.68, 1,382.46 and 726.90

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Solution

The fourth proportional to 922.68, 1,382.46 and 726.90 is: 1,089.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.68 : 1,382.46 = 726.90 : x
  2. Step 2: Convert to fraction form
    922.68/1,382.46 = 726.90/x
  3. Step 3: Cross multiply
    922.68x = 1,382.46 × 726.90
  4. Step 4: Simplify right side
    922.68x = 1,004,910.17
  5. Step 5: Solve for x
    x = 1,004,910.17/922.68
  6. Step 6: Final answer
    x = 1,089.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.