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Finding the Fourth Proportional to 15,013.92, 20,719.68 and 8,299.76

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Solution

The fourth proportional to 15,013.92, 20,719.68 and 8,299.76 is: 11,453.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,013.92 : 20,719.68 = 8,299.76 : x
  2. Step 2: Convert to fraction form
    15,013.92/20,719.68 = 8,299.76/x
  3. Step 3: Cross multiply
    15,013.92x = 20,719.68 × 8,299.76
  4. Step 4: Simplify right side
    15,013.92x = 171,968,371.28
  5. Step 5: Solve for x
    x = 171,968,371.28/15,013.92
  6. Step 6: Final answer
    x = 11,453.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.