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Finding the Fourth Proportional to 121,045.40, 181,568.10 and 81,387.80

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Solution

The fourth proportional to 121,045.40, 181,568.10 and 81,387.80 is: 122,081.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,045.40 : 181,568.10 = 81,387.80 : x
  2. Step 2: Convert to fraction form
    121,045.40/181,568.10 = 81,387.80/x
  3. Step 3: Cross multiply
    121,045.40x = 181,568.10 × 81,387.80
  4. Step 4: Simplify right side
    121,045.40x = 14,777,428,209.18
  5. Step 5: Solve for x
    x = 14,777,428,209.18/121,045.40
  6. Step 6: Final answer
    x = 122,081.70

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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.