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Finding the Fourth Proportional to 86,422.60, 129,633.90 and 81,173.80

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Solution

The fourth proportional to 86,422.60, 129,633.90 and 81,173.80 is: 121,760.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,422.60 : 129,633.90 = 81,173.80 : x
  2. Step 2: Convert to fraction form
    86,422.60/129,633.90 = 81,173.80/x
  3. Step 3: Cross multiply
    86,422.60x = 129,633.90 × 81,173.80
  4. Step 4: Simplify right side
    86,422.60x = 10,522,876,271.82
  5. Step 5: Solve for x
    x = 10,522,876,271.82/86,422.60
  6. Step 6: Final answer
    x = 121,760.70

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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.