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Finding the Fourth Proportional to 72,290.20, 108,429.90 and 30,159.40

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Solution

The fourth proportional to 72,290.20, 108,429.90 and 30,159.40 is: 45,236.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,290.20 : 108,429.90 = 30,159.40 : x
  2. Step 2: Convert to fraction form
    72,290.20/108,429.90 = 30,159.40/x
  3. Step 3: Cross multiply
    72,290.20x = 108,429.90 × 30,159.40
  4. Step 4: Simplify right side
    72,290.20x = 3,270,180,726.06
  5. Step 5: Solve for x
    x = 3,270,180,726.06/72,290.20
  6. Step 6: Final answer
    x = 45,236.85

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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.