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Finding the Fourth Proportional to 86,724.60, 130,086.90 and 81,475.80

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Solution

The fourth proportional to 86,724.60, 130,086.90 and 81,475.80 is: 122,213.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,724.60 : 130,086.90 = 81,475.80 : x
  2. Step 2: Convert to fraction form
    86,724.60/130,086.90 = 81,475.80/x
  3. Step 3: Cross multiply
    86,724.60x = 130,086.90 × 81,475.80
  4. Step 4: Simplify right side
    86,724.60x = 10,598,934,247.02
  5. Step 5: Solve for x
    x = 10,598,934,247.02/86,724.60
  6. Step 6: Final answer
    x = 122,213.70

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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.