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Finding the Fourth Proportional to 121,989.51, 168,340.14 and 71,003.79

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Solution

The fourth proportional to 121,989.51, 168,340.14 and 71,003.79 is: 97,982.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,989.51 : 168,340.14 = 71,003.79 : x
  2. Step 2: Convert to fraction form
    121,989.51/168,340.14 = 71,003.79/x
  3. Step 3: Cross multiply
    121,989.51x = 168,340.14 × 71,003.79
  4. Step 4: Simplify right side
    121,989.51x = 11,952,787,949.13
  5. Step 5: Solve for x
    x = 11,952,787,949.13/121,989.51
  6. Step 6: Final answer
    x = 97,982.10

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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.