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Finding the Fourth Proportional to 31.79, 47.61 and 15.51

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Solution

The fourth proportional to 31.79, 47.61 and 15.51 is: 23.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.79 : 47.61 = 15.51 : x
  2. Step 2: Convert to fraction form
    31.79/47.61 = 15.51/x
  3. Step 3: Cross multiply
    31.79x = 47.61 × 15.51
  4. Step 4: Simplify right side
    31.79x = 738.43
  5. Step 5: Solve for x
    x = 738.43/31.79
  6. Step 6: Final answer
    x = 23.23

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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.