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Finding the Fourth Proportional to 53,987.80, 80,922.30 and 18,909.40

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Solution

The fourth proportional to 53,987.80, 80,922.30 and 18,909.40 is: 28,343.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,987.80 : 80,922.30 = 18,909.40 : x
  2. Step 2: Convert to fraction form
    53,987.80/80,922.30 = 18,909.40/x
  3. Step 3: Cross multiply
    53,987.80x = 80,922.30 × 18,909.40
  4. Step 4: Simplify right side
    53,987.80x = 1,530,192,139.62
  5. Step 5: Solve for x
    x = 1,530,192,139.62/53,987.80
  6. Step 6: Final answer
    x = 28,343.29

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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.