Home / 90,765.20-136,172.10-80,972.30

Finding the Fourth Proportional to 90,765.20, 136,172.10 and 80,972.30

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Solution

The fourth proportional to 90,765.20, 136,172.10 and 80,972.30 is: 121,480.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,765.20 : 136,172.10 = 80,972.30 : x
  2. Step 2: Convert to fraction form
    90,765.20/136,172.10 = 80,972.30/x
  3. Step 3: Cross multiply
    90,765.20x = 136,172.10 × 80,972.30
  4. Step 4: Simplify right side
    90,765.20x = 11,026,168,132.83
  5. Step 5: Solve for x
    x = 11,026,168,132.83/90,765.20
  6. Step 6: Final answer
    x = 121,480.13

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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.