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Finding the Fourth Proportional to 81,146.40, 121,719.60 and 28,561.20

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Solution

The fourth proportional to 81,146.40, 121,719.60 and 28,561.20 is: 42,841.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,146.40 : 121,719.60 = 28,561.20 : x
  2. Step 2: Convert to fraction form
    81,146.40/121,719.60 = 28,561.20/x
  3. Step 3: Cross multiply
    81,146.40x = 121,719.60 × 28,561.20
  4. Step 4: Simplify right side
    81,146.40x = 3,476,457,839.52
  5. Step 5: Solve for x
    x = 3,476,457,839.52/81,146.40
  6. Step 6: Final answer
    x = 42,841.80

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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.