Home / 20,530.38-30,781.23-10,515.67

Finding the Fourth Proportional to 20,530.38, 30,781.23 and 10,515.67

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Solution

The fourth proportional to 20,530.38, 30,781.23 and 10,515.67 is: 15,766.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,530.38 : 30,781.23 = 10,515.67 : x
  2. Step 2: Convert to fraction form
    20,530.38/30,781.23 = 10,515.67/x
  3. Step 3: Cross multiply
    20,530.38x = 30,781.23 × 10,515.67
  4. Step 4: Simplify right side
    20,530.38x = 323,685,372.78
  5. Step 5: Solve for x
    x = 323,685,372.78/20,530.38
  6. Step 6: Final answer
    x = 15,766.17

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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.