Home / 138,428.20-207,872.70-76,143.40

Finding the Fourth Proportional to 138,428.20, 207,872.70 and 76,143.40

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Solution

The fourth proportional to 138,428.20, 207,872.70 and 76,143.40 is: 114,341.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,428.20 : 207,872.70 = 76,143.40 : x
  2. Step 2: Convert to fraction form
    138,428.20/207,872.70 = 76,143.40/x
  3. Step 3: Cross multiply
    138,428.20x = 207,872.70 × 76,143.40
  4. Step 4: Simplify right side
    138,428.20x = 15,828,134,145.18
  5. Step 5: Solve for x
    x = 15,828,134,145.18/138,428.20
  6. Step 6: Final answer
    x = 114,341.83

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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.