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Finding the Fourth Proportional to 1,358.91, 1,874.57 and 861.38

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Solution

The fourth proportional to 1,358.91, 1,874.57 and 861.38 is: 1,188.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.91 : 1,874.57 = 861.38 : x
  2. Step 2: Convert to fraction form
    1,358.91/1,874.57 = 861.38/x
  3. Step 3: Cross multiply
    1,358.91x = 1,874.57 × 861.38
  4. Step 4: Simplify right side
    1,358.91x = 1,614,703.43
  5. Step 5: Solve for x
    x = 1,614,703.43/1,358.91
  6. Step 6: Final answer
    x = 1,188.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.