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Finding the Fourth Proportional to 136,987.60, 205,351.80 and 80,870.80

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Solution

The fourth proportional to 136,987.60, 205,351.80 and 80,870.80 is: 121,229.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,987.60 : 205,351.80 = 80,870.80 : x
  2. Step 2: Convert to fraction form
    136,987.60/205,351.80 = 80,870.80/x
  3. Step 3: Cross multiply
    136,987.60x = 205,351.80 × 80,870.80
  4. Step 4: Simplify right side
    136,987.60x = 16,606,964,347.44
  5. Step 5: Solve for x
    x = 16,606,964,347.44/136,987.60
  6. Step 6: Final answer
    x = 121,229.69

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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.