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Finding the Fourth Proportional to 91,983.20, 137,974.80 and 76,431.20

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Solution

The fourth proportional to 91,983.20, 137,974.80 and 76,431.20 is: 114,646.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,983.20 : 137,974.80 = 76,431.20 : x
  2. Step 2: Convert to fraction form
    91,983.20/137,974.80 = 76,431.20/x
  3. Step 3: Cross multiply
    91,983.20x = 137,974.80 × 76,431.20
  4. Step 4: Simplify right side
    91,983.20x = 10,545,579,533.76
  5. Step 5: Solve for x
    x = 10,545,579,533.76/91,983.20
  6. Step 6: Final answer
    x = 114,646.80

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Similar ratio
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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.