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Finding the Fourth Proportional to 80,778.60, 121,159.35 and 21,620.25

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Solution

The fourth proportional to 80,778.60, 121,159.35 and 21,620.25 is: 32,428.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,778.60 : 121,159.35 = 21,620.25 : x
  2. Step 2: Convert to fraction form
    80,778.60/121,159.35 = 21,620.25/x
  3. Step 3: Cross multiply
    80,778.60x = 121,159.35 × 21,620.25
  4. Step 4: Simplify right side
    80,778.60x = 2,619,495,436.84
  5. Step 5: Solve for x
    x = 2,619,495,436.84/80,778.60
  6. Step 6: Final answer
    x = 32,428.09

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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.