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Finding the Fourth Proportional to 81,146.40, 121,719.60 and 21,989.40

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Solution

The fourth proportional to 81,146.40, 121,719.60 and 21,989.40 is: 32,984.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,146.40 : 121,719.60 = 21,989.40 : x
  2. Step 2: Convert to fraction form
    81,146.40/121,719.60 = 21,989.40/x
  3. Step 3: Cross multiply
    81,146.40x = 121,719.60 × 21,989.40
  4. Step 4: Simplify right side
    81,146.40x = 2,676,540,972.24
  5. Step 5: Solve for x
    x = 2,676,540,972.24/81,146.40
  6. Step 6: Final answer
    x = 32,984.10

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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.