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Finding the Fourth Proportional to 15.99, 21.99 and 14.64

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Solution

The fourth proportional to 15.99, 21.99 and 14.64 is: 20.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.99 : 21.99 = 14.64 : x
  2. Step 2: Convert to fraction form
    15.99/21.99 = 14.64/x
  3. Step 3: Cross multiply
    15.99x = 21.99 × 14.64
  4. Step 4: Simplify right side
    15.99x = 321.93
  5. Step 5: Solve for x
    x = 321.93/15.99
  6. Step 6: Final answer
    x = 20.13

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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.