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Finding the Fourth Proportional to 90,979.20, 136,468.80 and 75,427.20

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Solution

The fourth proportional to 90,979.20, 136,468.80 and 75,427.20 is: 113,140.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,979.20 : 136,468.80 = 75,427.20 : x
  2. Step 2: Convert to fraction form
    90,979.20/136,468.80 = 75,427.20/x
  3. Step 3: Cross multiply
    90,979.20x = 136,468.80 × 75,427.20
  4. Step 4: Simplify right side
    90,979.20x = 10,293,459,471.36
  5. Step 5: Solve for x
    x = 10,293,459,471.36/90,979.20
  6. Step 6: Final answer
    x = 113,140.80

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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.