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Finding the Fourth Proportional to 19.99, 27.58 and 15.38

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Solution

The fourth proportional to 19.99, 27.58 and 15.38 is: 21.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.99 : 27.58 = 15.38 : x
  2. Step 2: Convert to fraction form
    19.99/27.58 = 15.38/x
  3. Step 3: Cross multiply
    19.99x = 27.58 × 15.38
  4. Step 4: Simplify right side
    19.99x = 423.97
  5. Step 5: Solve for x
    x = 423.97/19.99
  6. Step 6: Final answer
    x = 21.21

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1.5x scale

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.