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Finding the Fourth Proportional to 121,616.64, 167,786.64 and 71,305.92

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Solution

The fourth proportional to 121,616.64, 167,786.64 and 71,305.92 is: 98,376.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,616.64 : 167,786.64 = 71,305.92 : x
  2. Step 2: Convert to fraction form
    121,616.64/167,786.64 = 71,305.92/x
  3. Step 3: Cross multiply
    121,616.64x = 167,786.64 × 71,305.92
  4. Step 4: Simplify right side
    121,616.64x = 11,964,180,728.91
  5. Step 5: Solve for x
    x = 11,964,180,728.91/121,616.64
  6. Step 6: Final answer
    x = 98,376.18

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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.