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Finding the Fourth Proportional to 18,999.78, 26,195.10 and 13,020.76

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Solution

The fourth proportional to 18,999.78, 26,195.10 and 13,020.76 is: 17,951.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.78 : 26,195.10 = 13,020.76 : x
  2. Step 2: Convert to fraction form
    18,999.78/26,195.10 = 13,020.76/x
  3. Step 3: Cross multiply
    18,999.78x = 26,195.10 × 13,020.76
  4. Step 4: Simplify right side
    18,999.78x = 341,080,110.28
  5. Step 5: Solve for x
    x = 341,080,110.28/18,999.78
  6. Step 6: Final answer
    x = 17,951.79

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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.