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Finding the Fourth Proportional to 80,992.60, 121,436.10 and 72,698.20

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Solution

The fourth proportional to 80,992.60, 121,436.10 and 72,698.20 is: 108,999.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,992.60 : 121,436.10 = 72,698.20 : x
  2. Step 2: Convert to fraction form
    80,992.60/121,436.10 = 72,698.20/x
  3. Step 3: Cross multiply
    80,992.60x = 121,436.10 × 72,698.20
  4. Step 4: Simplify right side
    80,992.60x = 8,828,185,885.02
  5. Step 5: Solve for x
    x = 8,828,185,885.02/80,992.60
  6. Step 6: Final answer
    x = 108,999.91

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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.