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Finding the Fourth Proportional to 70,806.30, 106,209.72 and 28,687.18

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Solution

The fourth proportional to 70,806.30, 106,209.72 and 28,687.18 is: 43,030.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,806.30 : 106,209.72 = 28,687.18 : x
  2. Step 2: Convert to fraction form
    70,806.30/106,209.72 = 28,687.18/x
  3. Step 3: Cross multiply
    70,806.30x = 106,209.72 × 28,687.18
  4. Step 4: Simplify right side
    70,806.30x = 3,046,857,355.39
  5. Step 5: Solve for x
    x = 3,046,857,355.39/70,806.30
  6. Step 6: Final answer
    x = 43,030.88

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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.