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Finding the Fourth Proportional to 91,791.40, 137,978.70 and 86,542.60

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Solution

The fourth proportional to 91,791.40, 137,978.70 and 86,542.60 is: 130,088.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,791.40 : 137,978.70 = 86,542.60 : x
  2. Step 2: Convert to fraction form
    91,791.40/137,978.70 = 86,542.60/x
  3. Step 3: Cross multiply
    91,791.40x = 137,978.70 × 86,542.60
  4. Step 4: Simplify right side
    91,791.40x = 11,941,035,442.62
  5. Step 5: Solve for x
    x = 11,941,035,442.62/91,791.40
  6. Step 6: Final answer
    x = 130,088.83

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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.