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Finding the Fourth Proportional to 15,115.76, 20,820.60 and 12,722.79

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Solution

The fourth proportional to 15,115.76, 20,820.60 and 12,722.79 is: 17,524.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.76 : 20,820.60 = 12,722.79 : x
  2. Step 2: Convert to fraction form
    15,115.76/20,820.60 = 12,722.79/x
  3. Step 3: Cross multiply
    15,115.76x = 20,820.60 × 12,722.79
  4. Step 4: Simplify right side
    15,115.76x = 264,896,121.47
  5. Step 5: Solve for x
    x = 264,896,121.47/15,115.76
  6. Step 6: Final answer
    x = 17,524.50

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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.