Home / 99,591.78-137,428.20-57,149.40

Finding the Fourth Proportional to 99,591.78, 137,428.20 and 57,149.40

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Solution

The fourth proportional to 99,591.78, 137,428.20 and 57,149.40 is: 78,861.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,591.78 : 137,428.20 = 57,149.40 : x
  2. Step 2: Convert to fraction form
    99,591.78/137,428.20 = 57,149.40/x
  3. Step 3: Cross multiply
    99,591.78x = 137,428.20 × 57,149.40
  4. Step 4: Simplify right side
    99,591.78x = 7,853,939,173.08
  5. Step 5: Solve for x
    x = 7,853,939,173.08/99,591.78
  6. Step 6: Final answer
    x = 78,861.32

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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.