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Finding the Fourth Proportional to 121,920.66, 168,175.17 and 83,662.74

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Solution

The fourth proportional to 121,920.66, 168,175.17 and 83,662.74 is: 115,402.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,920.66 : 168,175.17 = 83,662.74 : x
  2. Step 2: Convert to fraction form
    121,920.66/168,175.17 = 83,662.74/x
  3. Step 3: Cross multiply
    121,920.66x = 168,175.17 × 83,662.74
  4. Step 4: Simplify right side
    121,920.66x = 14,069,995,522.17
  5. Step 5: Solve for x
    x = 14,069,995,522.17/121,920.66
  6. Step 6: Final answer
    x = 115,402.88

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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.