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Finding the Fourth Proportional to 91,986.60, 137,979.90 and 74,490.60

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Solution

The fourth proportional to 91,986.60, 137,979.90 and 74,490.60 is: 111,735.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,986.60 : 137,979.90 = 74,490.60 : x
  2. Step 2: Convert to fraction form
    91,986.60/137,979.90 = 74,490.60/x
  3. Step 3: Cross multiply
    91,986.60x = 137,979.90 × 74,490.60
  4. Step 4: Simplify right side
    91,986.60x = 10,278,205,538.94
  5. Step 5: Solve for x
    x = 10,278,205,538.94/91,986.60
  6. Step 6: Final answer
    x = 111,735.90

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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.