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Finding the Fourth Proportional to 15,215.54, 20,995.89 and 8,755.01

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Solution

The fourth proportional to 15,215.54, 20,995.89 and 8,755.01 is: 12,081.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,215.54 : 20,995.89 = 8,755.01 : x
  2. Step 2: Convert to fraction form
    15,215.54/20,995.89 = 8,755.01/x
  3. Step 3: Cross multiply
    15,215.54x = 20,995.89 × 8,755.01
  4. Step 4: Simplify right side
    15,215.54x = 183,819,121.93
  5. Step 5: Solve for x
    x = 183,819,121.93/15,215.54
  6. Step 6: Final answer
    x = 12,081.02

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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.