Home / 20,747.76-31,121.76-5,165.40

Finding the Fourth Proportional to 20,747.76, 31,121.76 and 5,165.40

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Solution

The fourth proportional to 20,747.76, 31,121.76 and 5,165.40 is: 7,748.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,747.76 : 31,121.76 = 5,165.40 : x
  2. Step 2: Convert to fraction form
    20,747.76/31,121.76 = 5,165.40/x
  3. Step 3: Cross multiply
    20,747.76x = 31,121.76 × 5,165.40
  4. Step 4: Simplify right side
    20,747.76x = 160,756,339.10
  5. Step 5: Solve for x
    x = 160,756,339.10/20,747.76
  6. Step 6: Final answer
    x = 7,748.13

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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.