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Finding the Fourth Proportional to 121,620.78, 167,864.67 and 71,335.98

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Solution

The fourth proportional to 121,620.78, 167,864.67 and 71,335.98 is: 98,460.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,620.78 : 167,864.67 = 71,335.98 : x
  2. Step 2: Convert to fraction form
    121,620.78/167,864.67 = 71,335.98/x
  3. Step 3: Cross multiply
    121,620.78x = 167,864.67 × 71,335.98
  4. Step 4: Simplify right side
    121,620.78x = 11,974,790,741.83
  5. Step 5: Solve for x
    x = 11,974,790,741.83/121,620.78
  6. Step 6: Final answer
    x = 98,460.07

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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.