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Finding the Fourth Proportional to 1,250.70, 1,725.90 and 691.08

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Solution

The fourth proportional to 1,250.70, 1,725.90 and 691.08 is: 953.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.70 : 1,725.90 = 691.08 : x
  2. Step 2: Convert to fraction form
    1,250.70/1,725.90 = 691.08/x
  3. Step 3: Cross multiply
    1,250.70x = 1,725.90 × 691.08
  4. Step 4: Simplify right side
    1,250.70x = 1,192,734.97
  5. Step 5: Solve for x
    x = 1,192,734.97/1,250.70
  6. Step 6: Final answer
    x = 953.65

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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.