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Finding the Fourth Proportional to 72,720.32, 108,968.70 and 43,079.18

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Solution

The fourth proportional to 72,720.32, 108,968.70 and 43,079.18 is: 64,552.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,720.32 : 108,968.70 = 43,079.18 : x
  2. Step 2: Convert to fraction form
    72,720.32/108,968.70 = 43,079.18/x
  3. Step 3: Cross multiply
    72,720.32x = 108,968.70 × 43,079.18
  4. Step 4: Simplify right side
    72,720.32x = 4,694,282,241.67
  5. Step 5: Solve for x
    x = 4,694,282,241.67/72,720.32
  6. Step 6: Final answer
    x = 64,552.55

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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.