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Finding the Fourth Proportional to 87,991.80, 131,987.70 and 84,881.40

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Solution

The fourth proportional to 87,991.80, 131,987.70 and 84,881.40 is: 127,322.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,991.80 : 131,987.70 = 84,881.40 : x
  2. Step 2: Convert to fraction form
    87,991.80/131,987.70 = 84,881.40/x
  3. Step 3: Cross multiply
    87,991.80x = 131,987.70 × 84,881.40
  4. Step 4: Simplify right side
    87,991.80x = 11,203,300,758.78
  5. Step 5: Solve for x
    x = 11,203,300,758.78/87,991.80
  6. Step 6: Final answer
    x = 127,322.10

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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.