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Finding the Fourth Proportional to 72,080.80, 108,121.20 and 38,903.20

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Solution

The fourth proportional to 72,080.80, 108,121.20 and 38,903.20 is: 58,354.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,080.80 : 108,121.20 = 38,903.20 : x
  2. Step 2: Convert to fraction form
    72,080.80/108,121.20 = 38,903.20/x
  3. Step 3: Cross multiply
    72,080.80x = 108,121.20 × 38,903.20
  4. Step 4: Simplify right side
    72,080.80x = 4,206,260,667.84
  5. Step 5: Solve for x
    x = 4,206,260,667.84/72,080.80
  6. Step 6: Final answer
    x = 58,354.80

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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.