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Finding the Fourth Proportional to 28.84, 39.81 and 19.63

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Solution

The fourth proportional to 28.84, 39.81 and 19.63 is: 27.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.84 : 39.81 = 19.63 : x
  2. Step 2: Convert to fraction form
    28.84/39.81 = 19.63/x
  3. Step 3: Cross multiply
    28.84x = 39.81 × 19.63
  4. Step 4: Simplify right side
    28.84x = 781.47
  5. Step 5: Solve for x
    x = 781.47/28.84
  6. Step 6: Final answer
    x = 27.10

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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.