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Finding the Fourth Proportional to 15,015.62, 20,721.72 and 8,209.82

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Solution

The fourth proportional to 15,015.62, 20,721.72 and 8,209.82 is: 11,329.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,015.62 : 20,721.72 = 8,209.82 : x
  2. Step 2: Convert to fraction form
    15,015.62/20,721.72 = 8,209.82/x
  3. Step 3: Cross multiply
    15,015.62x = 20,721.72 × 8,209.82
  4. Step 4: Simplify right side
    15,015.62x = 170,121,591.29
  5. Step 5: Solve for x
    x = 170,121,591.29/15,015.62
  6. Step 6: Final answer
    x = 11,329.64

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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.