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Finding the Fourth Proportional to 81,365.86, 121,332.85 and 74,903.14

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Solution

The fourth proportional to 81,365.86, 121,332.85 and 74,903.14 is: 111,695.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,365.86 : 121,332.85 = 74,903.14 : x
  2. Step 2: Convert to fraction form
    81,365.86/121,332.85 = 74,903.14/x
  3. Step 3: Cross multiply
    81,365.86x = 121,332.85 × 74,903.14
  4. Step 4: Simplify right side
    81,365.86x = 9,088,211,450.15
  5. Step 5: Solve for x
    x = 9,088,211,450.15/81,365.86
  6. Step 6: Final answer
    x = 111,695.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.