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Finding the Fourth Proportional to 90,752.40, 135,869.40 and 81,421.20

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Solution

The fourth proportional to 90,752.40, 135,869.40 and 81,421.20 is: 121,899.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,752.40 : 135,869.40 = 81,421.20 : x
  2. Step 2: Convert to fraction form
    90,752.40/135,869.40 = 81,421.20/x
  3. Step 3: Cross multiply
    90,752.40x = 135,869.40 × 81,421.20
  4. Step 4: Simplify right side
    90,752.40x = 11,062,649,591.28
  5. Step 5: Solve for x
    x = 11,062,649,591.28/90,752.40
  6. Step 6: Final answer
    x = 121,899.25

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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.