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Finding the Fourth Proportional to 139,332.56, 192,358.60 and 91,724.30

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Solution

The fourth proportional to 139,332.56, 192,358.60 and 91,724.30 is: 126,631.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,332.56 : 192,358.60 = 91,724.30 : x
  2. Step 2: Convert to fraction form
    139,332.56/192,358.60 = 91,724.30/x
  3. Step 3: Cross multiply
    139,332.56x = 192,358.60 × 91,724.30
  4. Step 4: Simplify right side
    139,332.56x = 17,643,957,464.22
  5. Step 5: Solve for x
    x = 17,643,957,464.22/139,332.56
  6. Step 6: Final answer
    x = 126,631.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.