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Finding the Fourth Proportional to 31.36, 47.28 and 28.84

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Solution

The fourth proportional to 31.36, 47.28 and 28.84 is: 43.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.36 : 47.28 = 28.84 : x
  2. Step 2: Convert to fraction form
    31.36/47.28 = 28.84/x
  3. Step 3: Cross multiply
    31.36x = 47.28 × 28.84
  4. Step 4: Simplify right side
    31.36x = 1,363.17
  5. Step 5: Solve for x
    x = 1,363.17/31.36
  6. Step 6: Final answer
    x = 43.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.