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Finding the Fourth Proportional to 927.29, 1,391.61 and 621.11

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Solution

The fourth proportional to 927.29, 1,391.61 and 621.11 is: 932.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.29 : 1,391.61 = 621.11 : x
  2. Step 2: Convert to fraction form
    927.29/1,391.61 = 621.11/x
  3. Step 3: Cross multiply
    927.29x = 1,391.61 × 621.11
  4. Step 4: Simplify right side
    927.29x = 864,342.89
  5. Step 5: Solve for x
    x = 864,342.89/927.29
  6. Step 6: Final answer
    x = 932.12

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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.