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Finding the Fourth Proportional to 65,909.80, 98,864.70 and 28,512.10

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Solution

The fourth proportional to 65,909.80, 98,864.70 and 28,512.10 is: 42,768.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,909.80 : 98,864.70 = 28,512.10 : x
  2. Step 2: Convert to fraction form
    65,909.80/98,864.70 = 28,512.10/x
  3. Step 3: Cross multiply
    65,909.80x = 98,864.70 × 28,512.10
  4. Step 4: Simplify right side
    65,909.80x = 2,818,840,212.87
  5. Step 5: Solve for x
    x = 2,818,840,212.87/65,909.80
  6. Step 6: Final answer
    x = 42,768.15

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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.