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Finding the Fourth Proportional to 15.11, 21 and 14.98

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Solution

The fourth proportional to 15.11, 21 and 14.98 is: 20.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.11 : 21 = 14.98 : x
  2. Step 2: Convert to fraction form
    15.11/21 = 14.98/x
  3. Step 3: Cross multiply
    15.11x = 21 × 14.98
  4. Step 4: Simplify right side
    15.11x = 314.58
  5. Step 5: Solve for x
    x = 314.58/15.11
  6. Step 6: Final answer
    x = 20.82

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.