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Finding the Fourth Proportional to 140,560.60, 210,876.90 and 81,290.20

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Solution

The fourth proportional to 140,560.60, 210,876.90 and 81,290.20 is: 121,956.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,560.60 : 210,876.90 = 81,290.20 : x
  2. Step 2: Convert to fraction form
    140,560.60/210,876.90 = 81,290.20/x
  3. Step 3: Cross multiply
    140,560.60x = 210,876.90 × 81,290.20
  4. Step 4: Simplify right side
    140,560.60x = 17,142,225,376.38
  5. Step 5: Solve for x
    x = 17,142,225,376.38/140,560.60
  6. Step 6: Final answer
    x = 121,956.12

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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.