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Finding the Fourth Proportional to 90,338.42, 135,359.80 and 54,691.70

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Solution

The fourth proportional to 90,338.42, 135,359.80 and 54,691.70 is: 81,948.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,338.42 : 135,359.80 = 54,691.70 : x
  2. Step 2: Convert to fraction form
    90,338.42/135,359.80 = 54,691.70/x
  3. Step 3: Cross multiply
    90,338.42x = 135,359.80 × 54,691.70
  4. Step 4: Simplify right side
    90,338.42x = 7,403,057,573.66
  5. Step 5: Solve for x
    x = 7,403,057,573.66/90,338.42
  6. Step 6: Final answer
    x = 81,948.05

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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.