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Finding the Fourth Proportional to 121,918.79, 168,248.18 and 68,204.71

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Solution

The fourth proportional to 121,918.79, 168,248.18 and 68,204.71 is: 94,122.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,918.79 : 168,248.18 = 68,204.71 : x
  2. Step 2: Convert to fraction form
    121,918.79/168,248.18 = 68,204.71/x
  3. Step 3: Cross multiply
    121,918.79x = 168,248.18 × 68,204.71
  4. Step 4: Simplify right side
    121,918.79x = 11,475,318,074.82
  5. Step 5: Solve for x
    x = 11,475,318,074.82/121,918.79
  6. Step 6: Final answer
    x = 94,122.64

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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.