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Finding the Fourth Proportional to 81,119.40, 121,685.40 and 28,540.68

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Solution

The fourth proportional to 81,119.40, 121,685.40 and 28,540.68 is: 42,813.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,119.40 : 121,685.40 = 28,540.68 : x
  2. Step 2: Convert to fraction form
    81,119.40/121,685.40 = 28,540.68/x
  3. Step 3: Cross multiply
    81,119.40x = 121,685.40 × 28,540.68
  4. Step 4: Simplify right side
    81,119.40x = 3,472,984,062.07
  5. Step 5: Solve for x
    x = 3,472,984,062.07/81,119.40
  6. Step 6: Final answer
    x = 42,813.24

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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.