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Finding the Fourth Proportional to 31.65, 47.55 and 30.89

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Solution

The fourth proportional to 31.65, 47.55 and 30.89 is: 46.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.65 : 47.55 = 30.89 : x
  2. Step 2: Convert to fraction form
    31.65/47.55 = 30.89/x
  3. Step 3: Cross multiply
    31.65x = 47.55 × 30.89
  4. Step 4: Simplify right side
    31.65x = 1,468.94
  5. Step 5: Solve for x
    x = 1,468.94/31.65
  6. Step 6: Final answer
    x = 46.41

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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.