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Finding the Fourth Proportional to 85,889.28, 128,815.20 and 43,724.64

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Solution

The fourth proportional to 85,889.28, 128,815.20 and 43,724.64 is: 65,577.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,889.28 : 128,815.20 = 43,724.64 : x
  2. Step 2: Convert to fraction form
    85,889.28/128,815.20 = 43,724.64/x
  3. Step 3: Cross multiply
    85,889.28x = 128,815.20 × 43,724.64
  4. Step 4: Simplify right side
    85,889.28x = 5,632,398,246.53
  5. Step 5: Solve for x
    x = 5,632,398,246.53/85,889.28
  6. Step 6: Final answer
    x = 65,577.43

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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.