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Finding the Fourth Proportional to 14.15, 21.09 and 14.00

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Solution

The fourth proportional to 14.15, 21.09 and 14.00 is: 20.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.15 : 21.09 = 14.00 : x
  2. Step 2: Convert to fraction form
    14.15/21.09 = 14.00/x
  3. Step 3: Cross multiply
    14.15x = 21.09 × 14.00
  4. Step 4: Simplify right side
    14.15x = 295.15
  5. Step 5: Solve for x
    x = 295.15/14.15
  6. Step 6: Final answer
    x = 20.87

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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.