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Finding the Fourth Proportional to 65,909.43, 98,879.74 and 21,536.08

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Solution

The fourth proportional to 65,909.43, 98,879.74 and 21,536.08 is: 32,309.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,909.43 : 98,879.74 = 21,536.08 : x
  2. Step 2: Convert to fraction form
    65,909.43/98,879.74 = 21,536.08/x
  3. Step 3: Cross multiply
    65,909.43x = 98,879.74 × 21,536.08
  4. Step 4: Simplify right side
    65,909.43x = 2,129,481,689.98
  5. Step 5: Solve for x
    x = 2,129,481,689.98/65,909.43
  6. Step 6: Final answer
    x = 32,309.21

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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.