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Finding the Fourth Proportional to 108,934.30, 163,401.45 and 81,286.30

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Solution

The fourth proportional to 108,934.30, 163,401.45 and 81,286.30 is: 121,929.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,934.30 : 163,401.45 = 81,286.30 : x
  2. Step 2: Convert to fraction form
    108,934.30/163,401.45 = 81,286.30/x
  3. Step 3: Cross multiply
    108,934.30x = 163,401.45 × 81,286.30
  4. Step 4: Simplify right side
    108,934.30x = 13,282,299,285.14
  5. Step 5: Solve for x
    x = 13,282,299,285.14/108,934.30
  6. Step 6: Final answer
    x = 121,929.45

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.