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Finding the Fourth Proportional to 1,124.38, 1,687.38 and 638.38

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Solution

The fourth proportional to 1,124.38, 1,687.38 and 638.38 is: 958.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.38 : 1,687.38 = 638.38 : x
  2. Step 2: Convert to fraction form
    1,124.38/1,687.38 = 638.38/x
  3. Step 3: Cross multiply
    1,124.38x = 1,687.38 × 638.38
  4. Step 4: Simplify right side
    1,124.38x = 1,077,189.64
  5. Step 5: Solve for x
    x = 1,077,189.64/1,124.38
  6. Step 6: Final answer
    x = 958.03

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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.