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Finding the Fourth Proportional to 17,987.10, 26,972.55 and 8,121.30

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Solution

The fourth proportional to 17,987.10, 26,972.55 and 8,121.30 is: 12,178.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,987.10 : 26,972.55 = 8,121.30 : x
  2. Step 2: Convert to fraction form
    17,987.10/26,972.55 = 8,121.30/x
  3. Step 3: Cross multiply
    17,987.10x = 26,972.55 × 8,121.30
  4. Step 4: Simplify right side
    17,987.10x = 219,052,170.32
  5. Step 5: Solve for x
    x = 219,052,170.32/17,987.10
  6. Step 6: Final answer
    x = 12,178.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.