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Finding the Fourth Proportional to 1,123.88, 1,686.08 and 354.38

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Solution

The fourth proportional to 1,123.88, 1,686.08 and 354.38 is: 531.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.88 : 1,686.08 = 354.38 : x
  2. Step 2: Convert to fraction form
    1,123.88/1,686.08 = 354.38/x
  3. Step 3: Cross multiply
    1,123.88x = 1,686.08 × 354.38
  4. Step 4: Simplify right side
    1,123.88x = 597,505.49
  5. Step 5: Solve for x
    x = 597,505.49/1,123.88
  6. Step 6: Final answer
    x = 531.65

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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.