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Finding the Fourth Proportional to 90,825.20, 136,468.20 and 80,687.60

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Solution

The fourth proportional to 90,825.20, 136,468.20 and 80,687.60 is: 121,236.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,825.20 : 136,468.20 = 80,687.60 : x
  2. Step 2: Convert to fraction form
    90,825.20/136,468.20 = 80,687.60/x
  3. Step 3: Cross multiply
    90,825.20x = 136,468.20 × 80,687.60
  4. Step 4: Simplify right side
    90,825.20x = 11,011,291,534.32
  5. Step 5: Solve for x
    x = 11,011,291,534.32/90,825.20
  6. Step 6: Final answer
    x = 121,236.08

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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.