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Finding the Fourth Proportional to 15,021.74, 20,731.53 and 8,648.57

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Solution

The fourth proportional to 15,021.74, 20,731.53 and 8,648.57 is: 11,935.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,021.74 : 20,731.53 = 8,648.57 : x
  2. Step 2: Convert to fraction form
    15,021.74/20,731.53 = 8,648.57/x
  3. Step 3: Cross multiply
    15,021.74x = 20,731.53 × 8,648.57
  4. Step 4: Simplify right side
    15,021.74x = 179,297,984.75
  5. Step 5: Solve for x
    x = 179,297,984.75/15,021.74
  6. Step 6: Final answer
    x = 11,935.90

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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.