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Finding the Fourth Proportional to 90,772.40, 136,043.40 and 80,865.20

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Solution

The fourth proportional to 90,772.40, 136,043.40 and 80,865.20 is: 121,195.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,772.40 : 136,043.40 = 80,865.20 : x
  2. Step 2: Convert to fraction form
    90,772.40/136,043.40 = 80,865.20/x
  3. Step 3: Cross multiply
    90,772.40x = 136,043.40 × 80,865.20
  4. Step 4: Simplify right side
    90,772.40x = 11,001,176,749.68
  5. Step 5: Solve for x
    x = 11,001,176,749.68/90,772.40
  6. Step 6: Final answer
    x = 121,195.17

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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.