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Finding the Fourth Proportional to 121,913.28, 168,254.28 and 68,211.90

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Solution

The fourth proportional to 121,913.28, 168,254.28 and 68,211.90 is: 94,140.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,913.28 : 168,254.28 = 68,211.90 : x
  2. Step 2: Convert to fraction form
    121,913.28/168,254.28 = 68,211.90/x
  3. Step 3: Cross multiply
    121,913.28x = 168,254.28 × 68,211.90
  4. Step 4: Simplify right side
    121,913.28x = 11,476,944,121.93
  5. Step 5: Solve for x
    x = 11,476,944,121.93/121,913.28
  6. Step 6: Final answer
    x = 94,140.23

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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.