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Finding the Fourth Proportional to 121,887.70, 168,236.32 and 74,174.64

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Solution

The fourth proportional to 121,887.70, 168,236.32 and 74,174.64 is: 102,380.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,887.70 : 168,236.32 = 74,174.64 : x
  2. Step 2: Convert to fraction form
    121,887.70/168,236.32 = 74,174.64/x
  3. Step 3: Cross multiply
    121,887.70x = 168,236.32 × 74,174.64
  4. Step 4: Simplify right side
    121,887.70x = 12,478,868,470.92
  5. Step 5: Solve for x
    x = 12,478,868,470.92/121,887.70
  6. Step 6: Final answer
    x = 102,380.05

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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.