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Finding the Fourth Proportional to 1,123.17, 1,684.85 and 392.73

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Solution

The fourth proportional to 1,123.17, 1,684.85 and 392.73 is: 589.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.17 : 1,684.85 = 392.73 : x
  2. Step 2: Convert to fraction form
    1,123.17/1,684.85 = 392.73/x
  3. Step 3: Cross multiply
    1,123.17x = 1,684.85 × 392.73
  4. Step 4: Simplify right side
    1,123.17x = 661,689.18
  5. Step 5: Solve for x
    x = 661,689.18/1,123.17
  6. Step 6: Final answer
    x = 589.13

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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.