Home / 20,815.38-31,222.53-9,715.95

Finding the Fourth Proportional to 20,815.38, 31,222.53 and 9,715.95

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Solution

The fourth proportional to 20,815.38, 31,222.53 and 9,715.95 is: 14,573.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.38 : 31,222.53 = 9,715.95 : x
  2. Step 2: Convert to fraction form
    20,815.38/31,222.53 = 9,715.95/x
  3. Step 3: Cross multiply
    20,815.38x = 31,222.53 × 9,715.95
  4. Step 4: Simplify right side
    20,815.38x = 303,356,540.35
  5. Step 5: Solve for x
    x = 303,356,540.35/20,815.38
  6. Step 6: Final answer
    x = 14,573.67

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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.