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Finding the Fourth Proportional to 81,189.80, 121,771.42 and 28,586.92

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Solution

The fourth proportional to 81,189.80, 121,771.42 and 28,586.92 is: 42,875.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,189.80 : 121,771.42 = 28,586.92 : x
  2. Step 2: Convert to fraction form
    81,189.80/121,771.42 = 28,586.92/x
  3. Step 3: Cross multiply
    81,189.80x = 121,771.42 × 28,586.92
  4. Step 4: Simplify right side
    81,189.80x = 3,481,069,841.83
  5. Step 5: Solve for x
    x = 3,481,069,841.83/81,189.80
  6. Step 6: Final answer
    x = 42,875.70

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1.5x scale

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.