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Finding the Fourth Proportional to 121,461.92, 167,629.31 and 90,781.64

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Solution

The fourth proportional to 121,461.92, 167,629.31 and 90,781.64 is: 125,287.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,461.92 : 167,629.31 = 90,781.64 : x
  2. Step 2: Convert to fraction form
    121,461.92/167,629.31 = 90,781.64/x
  3. Step 3: Cross multiply
    121,461.92x = 167,629.31 × 90,781.64
  4. Step 4: Simplify right side
    121,461.92x = 15,217,663,673.87
  5. Step 5: Solve for x
    x = 15,217,663,673.87/121,461.92
  6. Step 6: Final answer
    x = 125,287.53

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1.5x scale

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.