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Finding the Fourth Proportional to 136,986.60, 205,350.30 and 80,869.80

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Solution

The fourth proportional to 136,986.60, 205,350.30 and 80,869.80 is: 121,228.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,986.60 : 205,350.30 = 80,869.80 : x
  2. Step 2: Convert to fraction form
    136,986.60/205,350.30 = 80,869.80/x
  3. Step 3: Cross multiply
    136,986.60x = 205,350.30 × 80,869.80
  4. Step 4: Simplify right side
    136,986.60x = 16,606,637,690.94
  5. Step 5: Solve for x
    x = 16,606,637,690.94/136,986.60
  6. Step 6: Final answer
    x = 121,228.19

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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.