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Finding the Fourth Proportional to 83,991.80, 125,987.70 and 42,001.40

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Solution

The fourth proportional to 83,991.80, 125,987.70 and 42,001.40 is: 63,002.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,991.80 : 125,987.70 = 42,001.40 : x
  2. Step 2: Convert to fraction form
    83,991.80/125,987.70 = 42,001.40/x
  3. Step 3: Cross multiply
    83,991.80x = 125,987.70 × 42,001.40
  4. Step 4: Simplify right side
    83,991.80x = 5,291,659,782.78
  5. Step 5: Solve for x
    x = 5,291,659,782.78/83,991.80
  6. Step 6: Final answer
    x = 63,002.10

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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.