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Finding the Fourth Proportional to 31.12, 46.64 and 19.71

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Solution

The fourth proportional to 31.12, 46.64 and 19.71 is: 29.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.12 : 46.64 = 19.71 : x
  2. Step 2: Convert to fraction form
    31.12/46.64 = 19.71/x
  3. Step 3: Cross multiply
    31.12x = 46.64 × 19.71
  4. Step 4: Simplify right side
    31.12x = 919.32
  5. Step 5: Solve for x
    x = 919.32/31.12
  6. Step 6: Final answer
    x = 29.54

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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.