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Finding the Fourth Proportional to 81,192.60, 121,616.10 and 67,368.60

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Solution

The fourth proportional to 81,192.60, 121,616.10 and 67,368.60 is: 100,909.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,192.60 : 121,616.10 = 67,368.60 : x
  2. Step 2: Convert to fraction form
    81,192.60/121,616.10 = 67,368.60/x
  3. Step 3: Cross multiply
    81,192.60x = 121,616.10 × 67,368.60
  4. Step 4: Simplify right side
    81,192.60x = 8,193,106,394.46
  5. Step 5: Solve for x
    x = 8,193,106,394.46/81,192.60
  6. Step 6: Final answer
    x = 100,909.52

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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.