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Finding the Fourth Proportional to 81,215.80, 121,842.90 and 25,811.80

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Solution

The fourth proportional to 81,215.80, 121,842.90 and 25,811.80 is: 38,723.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,215.80 : 121,842.90 = 25,811.80 : x
  2. Step 2: Convert to fraction form
    81,215.80/121,842.90 = 25,811.80/x
  3. Step 3: Cross multiply
    81,215.80x = 121,842.90 × 25,811.80
  4. Step 4: Simplify right side
    81,215.80x = 3,144,984,566.22
  5. Step 5: Solve for x
    x = 3,144,984,566.22/81,215.80
  6. Step 6: Final answer
    x = 38,723.80

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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.