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Finding the Fourth Proportional to 17.86, 26.90 and 15.86

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Solution

The fourth proportional to 17.86, 26.90 and 15.86 is: 23.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.86 : 26.90 = 15.86 : x
  2. Step 2: Convert to fraction form
    17.86/26.90 = 15.86/x
  3. Step 3: Cross multiply
    17.86x = 26.90 × 15.86
  4. Step 4: Simplify right side
    17.86x = 426.63
  5. Step 5: Solve for x
    x = 426.63/17.86
  6. Step 6: Final answer
    x = 23.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.