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Finding the Fourth Proportional to 72,729.80, 109,102.29 and 20,139.28

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Solution

The fourth proportional to 72,729.80, 109,102.29 and 20,139.28 is: 30,211.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,729.80 : 109,102.29 = 20,139.28 : x
  2. Step 2: Convert to fraction form
    72,729.80/109,102.29 = 20,139.28/x
  3. Step 3: Cross multiply
    72,729.80x = 109,102.29 × 20,139.28
  4. Step 4: Simplify right side
    72,729.80x = 2,197,241,945.66
  5. Step 5: Solve for x
    x = 2,197,241,945.66/72,729.80
  6. Step 6: Final answer
    x = 30,211.03

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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.