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Finding the Fourth Proportional to 18,910, 26,102.28 and 11,458

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Solution

The fourth proportional to 18,910, 26,102.28 and 11,458 is: 15,815.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,910 : 26,102.28 = 11,458 : x
  2. Step 2: Convert to fraction form
    18,910/26,102.28 = 11,458/x
  3. Step 3: Cross multiply
    18,910x = 26,102.28 × 11,458
  4. Step 4: Simplify right side
    18,910x = 299,079,924.24
  5. Step 5: Solve for x
    x = 299,079,924.24/18,910
  6. Step 6: Final answer
    x = 15,815.97

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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.