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Finding the Fourth Proportional to 91,999.20, 137,998.80 and 77,127.60

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Solution

The fourth proportional to 91,999.20, 137,998.80 and 77,127.60 is: 115,691.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,999.20 : 137,998.80 = 77,127.60 : x
  2. Step 2: Convert to fraction form
    91,999.20/137,998.80 = 77,127.60/x
  3. Step 3: Cross multiply
    91,999.20x = 137,998.80 × 77,127.60
  4. Step 4: Simplify right side
    91,999.20x = 10,643,516,246.88
  5. Step 5: Solve for x
    x = 10,643,516,246.88/91,999.20
  6. Step 6: Final answer
    x = 115,691.40

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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.