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Finding the Fourth Proportional to 31.36, 47.28 and 30.88

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Solution

The fourth proportional to 31.36, 47.28 and 30.88 is: 46.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.36 : 47.28 = 30.88 : x
  2. Step 2: Convert to fraction form
    31.36/47.28 = 30.88/x
  3. Step 3: Cross multiply
    31.36x = 47.28 × 30.88
  4. Step 4: Simplify right side
    31.36x = 1,460.01
  5. Step 5: Solve for x
    x = 1,460.01/31.36
  6. Step 6: Final answer
    x = 46.56

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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.