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Finding the Fourth Proportional to 16.71, 23.07 and 15.72

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Solution

The fourth proportional to 16.71, 23.07 and 15.72 is: 21.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.71 : 23.07 = 15.72 : x
  2. Step 2: Convert to fraction form
    16.71/23.07 = 15.72/x
  3. Step 3: Cross multiply
    16.71x = 23.07 × 15.72
  4. Step 4: Simplify right side
    16.71x = 362.66
  5. Step 5: Solve for x
    x = 362.66/16.71
  6. Step 6: Final answer
    x = 21.70

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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.