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Finding the Fourth Proportional to 121,613.28, 167,854.32 and 71,328.48

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Solution

The fourth proportional to 121,613.28, 167,854.32 and 71,328.48 is: 98,449.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,613.28 : 167,854.32 = 71,328.48 : x
  2. Step 2: Convert to fraction form
    121,613.28/167,854.32 = 71,328.48/x
  3. Step 3: Cross multiply
    121,613.28x = 167,854.32 × 71,328.48
  4. Step 4: Simplify right side
    121,613.28x = 11,972,793,507.03
  5. Step 5: Solve for x
    x = 11,972,793,507.03/121,613.28
  6. Step 6: Final answer
    x = 98,449.72

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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.