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Finding the Fourth Proportional to 15,217.92, 20,998.80 and 8,928

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Solution

The fourth proportional to 15,217.92, 20,998.80 and 8,928 is: 12,319.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,217.92 : 20,998.80 = 8,928 : x
  2. Step 2: Convert to fraction form
    15,217.92/20,998.80 = 8,928/x
  3. Step 3: Cross multiply
    15,217.92x = 20,998.80 × 8,928
  4. Step 4: Simplify right side
    15,217.92x = 187,477,286.40
  5. Step 5: Solve for x
    x = 187,477,286.40/15,217.92
  6. Step 6: Final answer
    x = 12,319.51

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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.