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Finding the Fourth Proportional to 393,422.76, 589,989.56 and 140,635.04

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Solution

The fourth proportional to 393,422.76, 589,989.56 and 140,635.04 is: 210,900.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,422.76 : 589,989.56 = 140,635.04 : x
  2. Step 2: Convert to fraction form
    393,422.76/589,989.56 = 140,635.04/x
  3. Step 3: Cross multiply
    393,422.76x = 589,989.56 × 140,635.04
  4. Step 4: Simplify right side
    393,422.76x = 82,973,205,370.18
  5. Step 5: Solve for x
    x = 82,973,205,370.18/393,422.76
  6. Step 6: Final answer
    x = 210,900.88

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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.