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Finding the Fourth Proportional to 90,964.80, 136,447.20 and 72,010.80

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Solution

The fourth proportional to 90,964.80, 136,447.20 and 72,010.80 is: 108,016.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,964.80 : 136,447.20 = 72,010.80 : x
  2. Step 2: Convert to fraction form
    90,964.80/136,447.20 = 72,010.80/x
  3. Step 3: Cross multiply
    90,964.80x = 136,447.20 × 72,010.80
  4. Step 4: Simplify right side
    90,964.80x = 9,825,672,029.76
  5. Step 5: Solve for x
    x = 9,825,672,029.76/90,964.80
  6. Step 6: Final answer
    x = 108,016.20

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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.