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Finding the Fourth Proportional to 87,987.80, 131,981.70 and 54,810.20

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Solution

The fourth proportional to 87,987.80, 131,981.70 and 54,810.20 is: 82,215.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,987.80 : 131,981.70 = 54,810.20 : x
  2. Step 2: Convert to fraction form
    87,987.80/131,981.70 = 54,810.20/x
  3. Step 3: Cross multiply
    87,987.80x = 131,981.70 × 54,810.20
  4. Step 4: Simplify right side
    87,987.80x = 7,233,943,373.34
  5. Step 5: Solve for x
    x = 7,233,943,373.34/87,987.80
  6. Step 6: Final answer
    x = 82,215.30

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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.