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Finding the Fourth Proportional to 86,475.60, 129,713.40 and 82,393.20

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Solution

The fourth proportional to 86,475.60, 129,713.40 and 82,393.20 is: 123,589.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,475.60 : 129,713.40 = 82,393.20 : x
  2. Step 2: Convert to fraction form
    86,475.60/129,713.40 = 82,393.20/x
  3. Step 3: Cross multiply
    86,475.60x = 129,713.40 × 82,393.20
  4. Step 4: Simplify right side
    86,475.60x = 10,687,502,108.88
  5. Step 5: Solve for x
    x = 10,687,502,108.88/86,475.60
  6. Step 6: Final answer
    x = 123,589.80

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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.