Home / 20,689.76-31,034.28-5,107.40

Finding the Fourth Proportional to 20,689.76, 31,034.28 and 5,107.40

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Solution

The fourth proportional to 20,689.76, 31,034.28 and 5,107.40 is: 7,661.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.76 : 31,034.28 = 5,107.40 : x
  2. Step 2: Convert to fraction form
    20,689.76/31,034.28 = 5,107.40/x
  3. Step 3: Cross multiply
    20,689.76x = 31,034.28 × 5,107.40
  4. Step 4: Simplify right side
    20,689.76x = 158,504,481.67
  5. Step 5: Solve for x
    x = 158,504,481.67/20,689.76
  6. Step 6: Final answer
    x = 7,661.01

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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.