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Finding the Fourth Proportional to 3,937.55, 5,902.68 and 1,987.49

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Solution

The fourth proportional to 3,937.55, 5,902.68 and 1,987.49 is: 2,979.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,937.55 : 5,902.68 = 1,987.49 : x
  2. Step 2: Convert to fraction form
    3,937.55/5,902.68 = 1,987.49/x
  3. Step 3: Cross multiply
    3,937.55x = 5,902.68 × 1,987.49
  4. Step 4: Simplify right side
    3,937.55x = 11,731,517.47
  5. Step 5: Solve for x
    x = 11,731,517.47/3,937.55
  6. Step 6: Final answer
    x = 2,979.40

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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.