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Finding the Fourth Proportional to 91,213.80, 136,820.70 and 82,356.45

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Solution

The fourth proportional to 91,213.80, 136,820.70 and 82,356.45 is: 123,534.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,213.80 : 136,820.70 = 82,356.45 : x
  2. Step 2: Convert to fraction form
    91,213.80/136,820.70 = 82,356.45/x
  3. Step 3: Cross multiply
    91,213.80x = 136,820.70 × 82,356.45
  4. Step 4: Simplify right side
    91,213.80x = 11,268,067,138.52
  5. Step 5: Solve for x
    x = 11,268,067,138.52/91,213.80
  6. Step 6: Final answer
    x = 123,534.68

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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.