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Finding the Fourth Proportional to 81,280.64, 121,929.60 and 22,117.28

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Solution

The fourth proportional to 81,280.64, 121,929.60 and 22,117.28 is: 33,178.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,280.64 : 121,929.60 = 22,117.28 : x
  2. Step 2: Convert to fraction form
    81,280.64/121,929.60 = 22,117.28/x
  3. Step 3: Cross multiply
    81,280.64x = 121,929.60 × 22,117.28
  4. Step 4: Simplify right side
    81,280.64x = 2,696,751,103.49
  5. Step 5: Solve for x
    x = 2,696,751,103.49/81,280.64
  6. Step 6: Final answer
    x = 33,178.27

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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.