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Finding the Fourth Proportional to 18.93, 26.15 and 16.21

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Solution

The fourth proportional to 18.93, 26.15 and 16.21 is: 22.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.93 : 26.15 = 16.21 : x
  2. Step 2: Convert to fraction form
    18.93/26.15 = 16.21/x
  3. Step 3: Cross multiply
    18.93x = 26.15 × 16.21
  4. Step 4: Simplify right side
    18.93x = 423.89
  5. Step 5: Solve for x
    x = 423.89/18.93
  6. Step 6: Final answer
    x = 22.39

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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.