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Finding the Fourth Proportional to 1,381.88, 2,073.49 and 861.75

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Solution

The fourth proportional to 1,381.88, 2,073.49 and 861.75 is: 1,293.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.88 : 2,073.49 = 861.75 : x
  2. Step 2: Convert to fraction form
    1,381.88/2,073.49 = 861.75/x
  3. Step 3: Cross multiply
    1,381.88x = 2,073.49 × 861.75
  4. Step 4: Simplify right side
    1,381.88x = 1,786,827.85
  5. Step 5: Solve for x
    x = 1,786,827.85/1,381.88
  6. Step 6: Final answer
    x = 1,293.04

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1.5x scale

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.