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Finding the Fourth Proportional to 31.93, 47.81 and 21.76

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Solution

The fourth proportional to 31.93, 47.81 and 21.76 is: 32.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.93 : 47.81 = 21.76 : x
  2. Step 2: Convert to fraction form
    31.93/47.81 = 21.76/x
  3. Step 3: Cross multiply
    31.93x = 47.81 × 21.76
  4. Step 4: Simplify right side
    31.93x = 1,040.28
  5. Step 5: Solve for x
    x = 1,040.28/31.93
  6. Step 6: Final answer
    x = 32.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.