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Finding the Fourth Proportional to 18,990.90, 26,185.21 and 12,944.72

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Solution

The fourth proportional to 18,990.90, 26,185.21 and 12,944.72 is: 17,848.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.90 : 26,185.21 = 12,944.72 : x
  2. Step 2: Convert to fraction form
    18,990.90/26,185.21 = 12,944.72/x
  3. Step 3: Cross multiply
    18,990.90x = 26,185.21 × 12,944.72
  4. Step 4: Simplify right side
    18,990.90x = 338,960,358.33
  5. Step 5: Solve for x
    x = 338,960,358.33/18,990.90
  6. Step 6: Final answer
    x = 17,848.56

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Double scale
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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.