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Finding the Fourth Proportional to 281,120.40, 421,680.60 and 81,447.30

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Solution

The fourth proportional to 281,120.40, 421,680.60 and 81,447.30 is: 122,170.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,120.40 : 421,680.60 = 81,447.30 : x
  2. Step 2: Convert to fraction form
    281,120.40/421,680.60 = 81,447.30/x
  3. Step 3: Cross multiply
    281,120.40x = 421,680.60 × 81,447.30
  4. Step 4: Simplify right side
    281,120.40x = 34,344,746,332.38
  5. Step 5: Solve for x
    x = 34,344,746,332.38/281,120.40
  6. Step 6: Final answer
    x = 122,170.95

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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.