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Finding the Fourth Proportional to 65,653.20, 98,481.16 and 21,279.88

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Solution

The fourth proportional to 65,653.20, 98,481.16 and 21,279.88 is: 31,920.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,653.20 : 98,481.16 = 21,279.88 : x
  2. Step 2: Convert to fraction form
    65,653.20/98,481.16 = 21,279.88/x
  3. Step 3: Cross multiply
    65,653.20x = 98,481.16 × 21,279.88
  4. Step 4: Simplify right side
    65,653.20x = 2,095,667,267.06
  5. Step 5: Solve for x
    x = 2,095,667,267.06/65,653.20
  6. Step 6: Final answer
    x = 31,920.26

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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.