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Finding the Fourth Proportional to 43,691.20, 65,536.80 and 10,859.20

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Solution

The fourth proportional to 43,691.20, 65,536.80 and 10,859.20 is: 16,288.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,691.20 : 65,536.80 = 10,859.20 : x
  2. Step 2: Convert to fraction form
    43,691.20/65,536.80 = 10,859.20/x
  3. Step 3: Cross multiply
    43,691.20x = 65,536.80 × 10,859.20
  4. Step 4: Simplify right side
    43,691.20x = 711,677,218.56
  5. Step 5: Solve for x
    x = 711,677,218.56/43,691.20
  6. Step 6: Final answer
    x = 16,288.80

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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.