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Finding the Fourth Proportional to 1,250.71, 1,725.96 and 691.20

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Solution

The fourth proportional to 1,250.71, 1,725.96 and 691.20 is: 953.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.71 : 1,725.96 = 691.20 : x
  2. Step 2: Convert to fraction form
    1,250.71/1,725.96 = 691.20/x
  3. Step 3: Cross multiply
    1,250.71x = 1,725.96 × 691.20
  4. Step 4: Simplify right side
    1,250.71x = 1,192,982.26
  5. Step 5: Solve for x
    x = 1,192,982.26/1,250.71
  6. Step 6: Final answer
    x = 953.85

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1.5x scale

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.