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Finding the Fourth Proportional to 128,986.65, 193,498.20 and 40,230.90

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Solution

The fourth proportional to 128,986.65, 193,498.20 and 40,230.90 is: 60,352.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,986.65 : 193,498.20 = 40,230.90 : x
  2. Step 2: Convert to fraction form
    128,986.65/193,498.20 = 40,230.90/x
  3. Step 3: Cross multiply
    128,986.65x = 193,498.20 × 40,230.90
  4. Step 4: Simplify right side
    128,986.65x = 7,784,606,734.38
  5. Step 5: Solve for x
    x = 7,784,606,734.38/128,986.65
  6. Step 6: Final answer
    x = 60,352.03

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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.