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Finding the Fourth Proportional to 15.86, 23.65 and 15.09

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Solution

The fourth proportional to 15.86, 23.65 and 15.09 is: 22.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.86 : 23.65 = 15.09 : x
  2. Step 2: Convert to fraction form
    15.86/23.65 = 15.09/x
  3. Step 3: Cross multiply
    15.86x = 23.65 × 15.09
  4. Step 4: Simplify right side
    15.86x = 356.88
  5. Step 5: Solve for x
    x = 356.88/15.86
  6. Step 6: Final answer
    x = 22.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.