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Finding the Fourth Proportional to 65,891.72, 98,843.66 and 21,518.70

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Solution

The fourth proportional to 65,891.72, 98,843.66 and 21,518.70 is: 32,280.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,891.72 : 98,843.66 = 21,518.70 : x
  2. Step 2: Convert to fraction form
    65,891.72/98,843.66 = 21,518.70/x
  3. Step 3: Cross multiply
    65,891.72x = 98,843.66 × 21,518.70
  4. Step 4: Simplify right side
    65,891.72x = 2,126,987,066.44
  5. Step 5: Solve for x
    x = 2,126,987,066.44/65,891.72
  6. Step 6: Final answer
    x = 32,280.04

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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.