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Finding the Fourth Proportional to 140,722.40, 210,824.40 and 131,391.20

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Solution

The fourth proportional to 140,722.40, 210,824.40 and 131,391.20 is: 196,844.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,722.40 : 210,824.40 = 131,391.20 : x
  2. Step 2: Convert to fraction form
    140,722.40/210,824.40 = 131,391.20/x
  3. Step 3: Cross multiply
    140,722.40x = 210,824.40 × 131,391.20
  4. Step 4: Simplify right side
    140,722.40x = 27,700,470,905.28
  5. Step 5: Solve for x
    x = 27,700,470,905.28/140,722.40
  6. Step 6: Final answer
    x = 196,844.79

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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.