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Finding the Fourth Proportional to 122,640.57, 169,245.45 and 74,241.81

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Solution

The fourth proportional to 122,640.57, 169,245.45 and 74,241.81 is: 102,454.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,640.57 : 169,245.45 = 74,241.81 : x
  2. Step 2: Convert to fraction form
    122,640.57/169,245.45 = 74,241.81/x
  3. Step 3: Cross multiply
    122,640.57x = 169,245.45 × 74,241.81
  4. Step 4: Simplify right side
    122,640.57x = 12,565,088,542.26
  5. Step 5: Solve for x
    x = 12,565,088,542.26/122,640.57
  6. Step 6: Final answer
    x = 102,454.58

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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.