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Finding the Fourth Proportional to 57,909.80, 86,816.10 and 30,207.80

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Solution

The fourth proportional to 57,909.80, 86,816.10 and 30,207.80 is: 45,286.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,909.80 : 86,816.10 = 30,207.80 : x
  2. Step 2: Convert to fraction form
    57,909.80/86,816.10 = 30,207.80/x
  3. Step 3: Cross multiply
    57,909.80x = 86,816.10 × 30,207.80
  4. Step 4: Simplify right side
    57,909.80x = 2,622,523,385.58
  5. Step 5: Solve for x
    x = 2,622,523,385.58/57,909.80
  6. Step 6: Final answer
    x = 45,286.35

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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.