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Finding the Fourth Proportional to 31.65, 47.40 and 31.01

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Solution

The fourth proportional to 31.65, 47.40 and 31.01 is: 46.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.65 : 47.40 = 31.01 : x
  2. Step 2: Convert to fraction form
    31.65/47.40 = 31.01/x
  3. Step 3: Cross multiply
    31.65x = 47.40 × 31.01
  4. Step 4: Simplify right side
    31.65x = 1,469.64
  5. Step 5: Solve for x
    x = 1,469.64/31.65
  6. Step 6: Final answer
    x = 46.43

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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.