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Finding the Fourth Proportional to 121,618.64, 167,789.40 and 71,307.92

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Solution

The fourth proportional to 121,618.64, 167,789.40 and 71,307.92 is: 98,378.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,618.64 : 167,789.40 = 71,307.92 : x
  2. Step 2: Convert to fraction form
    121,618.64/167,789.40 = 71,307.92/x
  3. Step 3: Cross multiply
    121,618.64x = 167,789.40 × 71,307.92
  4. Step 4: Simplify right side
    121,618.64x = 11,964,713,112.05
  5. Step 5: Solve for x
    x = 11,964,713,112.05/121,618.64
  6. Step 6: Final answer
    x = 98,378.94

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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.