Home / 128,990.12-193,559.88-54,103.60

Finding the Fourth Proportional to 128,990.12, 193,559.88 and 54,103.60

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Solution

The fourth proportional to 128,990.12, 193,559.88 and 54,103.60 is: 81,186.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,990.12 : 193,559.88 = 54,103.60 : x
  2. Step 2: Convert to fraction form
    128,990.12/193,559.88 = 54,103.60/x
  3. Step 3: Cross multiply
    128,990.12x = 193,559.88 × 54,103.60
  4. Step 4: Simplify right side
    128,990.12x = 10,472,286,323.57
  5. Step 5: Solve for x
    x = 10,472,286,323.57/128,990.12
  6. Step 6: Final answer
    x = 81,186.73

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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.