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Finding the Fourth Proportional to 81,191.52, 121,797 and 28,590.12

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Solution

The fourth proportional to 81,191.52, 121,797 and 28,590.12 is: 42,888.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,191.52 : 121,797 = 28,590.12 : x
  2. Step 2: Convert to fraction form
    81,191.52/121,797 = 28,590.12/x
  3. Step 3: Cross multiply
    81,191.52x = 121,797 × 28,590.12
  4. Step 4: Simplify right side
    81,191.52x = 3,482,190,845.64
  5. Step 5: Solve for x
    x = 3,482,190,845.64/81,191.52
  6. Step 6: Final answer
    x = 42,888.60

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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.