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Finding the Fourth Proportional to 13.99, 21 and 13.66

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Solution

The fourth proportional to 13.99, 21 and 13.66 is: 20.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.99 : 21 = 13.66 : x
  2. Step 2: Convert to fraction form
    13.99/21 = 13.66/x
  3. Step 3: Cross multiply
    13.99x = 21 × 13.66
  4. Step 4: Simplify right side
    13.99x = 286.86
  5. Step 5: Solve for x
    x = 286.86/13.99
  6. Step 6: Final answer
    x = 20.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.