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Finding the Fourth Proportional to 2,691.90, 3,715.20 and 1,572.57

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Solution

The fourth proportional to 2,691.90, 3,715.20 and 1,572.57 is: 2,170.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,691.90 : 3,715.20 = 1,572.57 : x
  2. Step 2: Convert to fraction form
    2,691.90/3,715.20 = 1,572.57/x
  3. Step 3: Cross multiply
    2,691.90x = 3,715.20 × 1,572.57
  4. Step 4: Simplify right side
    2,691.90x = 5,842,412.06
  5. Step 5: Solve for x
    x = 5,842,412.06/2,691.90
  6. Step 6: Final answer
    x = 2,170.37

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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.