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Finding the Fourth Proportional to 3,987.50, 5,982.21 and 1,251.50

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Solution

The fourth proportional to 3,987.50, 5,982.21 and 1,251.50 is: 1,877.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.50 : 5,982.21 = 1,251.50 : x
  2. Step 2: Convert to fraction form
    3,987.50/5,982.21 = 1,251.50/x
  3. Step 3: Cross multiply
    3,987.50x = 5,982.21 × 1,251.50
  4. Step 4: Simplify right side
    3,987.50x = 7,486,735.82
  5. Step 5: Solve for x
    x = 7,486,735.82/3,987.50
  6. Step 6: Final answer
    x = 1,877.55

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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.