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Finding the Fourth Proportional to 65,789.80, 98,636.10 and 28,319.20

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Solution

The fourth proportional to 65,789.80, 98,636.10 and 28,319.20 is: 42,457.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,789.80 : 98,636.10 = 28,319.20 : x
  2. Step 2: Convert to fraction form
    65,789.80/98,636.10 = 28,319.20/x
  3. Step 3: Cross multiply
    65,789.80x = 98,636.10 × 28,319.20
  4. Step 4: Simplify right side
    65,789.80x = 2,793,295,443.12
  5. Step 5: Solve for x
    x = 2,793,295,443.12/65,789.80
  6. Step 6: Final answer
    x = 42,457.88

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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.