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Finding the Fourth Proportional to 86,655.60, 129,724.20 and 81,529.20

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Solution

The fourth proportional to 86,655.60, 129,724.20 and 81,529.20 is: 122,049.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,655.60 : 129,724.20 = 81,529.20 : x
  2. Step 2: Convert to fraction form
    86,655.60/129,724.20 = 81,529.20/x
  3. Step 3: Cross multiply
    86,655.60x = 129,724.20 × 81,529.20
  4. Step 4: Simplify right side
    86,655.60x = 10,576,310,246.64
  5. Step 5: Solve for x
    x = 10,576,310,246.64/86,655.60
  6. Step 6: Final answer
    x = 122,049.93

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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.