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Finding the Fourth Proportional to 91,373.80, 137,060.70 and 76,858.60

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Solution

The fourth proportional to 91,373.80, 137,060.70 and 76,858.60 is: 115,287.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,373.80 : 137,060.70 = 76,858.60 : x
  2. Step 2: Convert to fraction form
    91,373.80/137,060.70 = 76,858.60/x
  3. Step 3: Cross multiply
    91,373.80x = 137,060.70 × 76,858.60
  4. Step 4: Simplify right side
    91,373.80x = 10,534,293,517.02
  5. Step 5: Solve for x
    x = 10,534,293,517.02/91,373.80
  6. Step 6: Final answer
    x = 115,287.90

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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.