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Finding the Fourth Proportional to 13.99, 20.87 and 12.17

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Solution

The fourth proportional to 13.99, 20.87 and 12.17 is: 18.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.99 : 20.87 = 12.17 : x
  2. Step 2: Convert to fraction form
    13.99/20.87 = 12.17/x
  3. Step 3: Cross multiply
    13.99x = 20.87 × 12.17
  4. Step 4: Simplify right side
    13.99x = 253.91
  5. Step 5: Solve for x
    x = 253.91/13.99
  6. Step 6: Final answer
    x = 18.15

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1.5x scale

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.