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Finding the Fourth Proportional to 121,473, 167,655.42 and 71,172

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Solution

The fourth proportional to 121,473, 167,655.42 and 71,172 is: 98,230.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,473 : 167,655.42 = 71,172 : x
  2. Step 2: Convert to fraction form
    121,473/167,655.42 = 71,172/x
  3. Step 3: Cross multiply
    121,473x = 167,655.42 × 71,172
  4. Step 4: Simplify right side
    121,473x = 11,932,371,552.24
  5. Step 5: Solve for x
    x = 11,932,371,552.24/121,473
  6. Step 6: Final answer
    x = 98,230.65

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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.