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Finding the Fourth Proportional to 17,990.76, 26,989.02 and 8,129.64

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Solution

The fourth proportional to 17,990.76, 26,989.02 and 8,129.64 is: 12,195.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,990.76 : 26,989.02 = 8,129.64 : x
  2. Step 2: Convert to fraction form
    17,990.76/26,989.02 = 8,129.64/x
  3. Step 3: Cross multiply
    17,990.76x = 26,989.02 × 8,129.64
  4. Step 4: Simplify right side
    17,990.76x = 219,411,016.55
  5. Step 5: Solve for x
    x = 219,411,016.55/17,990.76
  6. Step 6: Final answer
    x = 12,195.76

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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.