Home / 99,979.68-137,972.24-54,658.20

Finding the Fourth Proportional to 99,979.68, 137,972.24 and 54,658.20

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Solution

The fourth proportional to 99,979.68, 137,972.24 and 54,658.20 is: 75,428.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,979.68 : 137,972.24 = 54,658.20 : x
  2. Step 2: Convert to fraction form
    99,979.68/137,972.24 = 54,658.20/x
  3. Step 3: Cross multiply
    99,979.68x = 137,972.24 × 54,658.20
  4. Step 4: Simplify right side
    99,979.68x = 7,541,314,288.37
  5. Step 5: Solve for x
    x = 7,541,314,288.37/99,979.68
  6. Step 6: Final answer
    x = 75,428.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.