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Finding the Fourth Proportional to 15,121.22, 20,870.62 and 8,752.20

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Solution

The fourth proportional to 15,121.22, 20,870.62 and 8,752.20 is: 12,079.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.22 : 20,870.62 = 8,752.20 : x
  2. Step 2: Convert to fraction form
    15,121.22/20,870.62 = 8,752.20/x
  3. Step 3: Cross multiply
    15,121.22x = 20,870.62 × 8,752.20
  4. Step 4: Simplify right side
    15,121.22x = 182,663,840.36
  5. Step 5: Solve for x
    x = 182,663,840.36/15,121.22
  6. Step 6: Final answer
    x = 12,079.97

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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.