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Finding the Fourth Proportional to 1,123.38, 1,685.43 and 759.54

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Solution

The fourth proportional to 1,123.38, 1,685.43 and 759.54 is: 1,139.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.38 : 1,685.43 = 759.54 : x
  2. Step 2: Convert to fraction form
    1,123.38/1,685.43 = 759.54/x
  3. Step 3: Cross multiply
    1,123.38x = 1,685.43 × 759.54
  4. Step 4: Simplify right side
    1,123.38x = 1,280,151.50
  5. Step 5: Solve for x
    x = 1,280,151.50/1,123.38
  6. Step 6: Final answer
    x = 1,139.55

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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.