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Finding the Fourth Proportional to 47.05, 70.61 and 31.79

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Solution

The fourth proportional to 47.05, 70.61 and 31.79 is: 47.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.05 : 70.61 = 31.79 : x
  2. Step 2: Convert to fraction form
    47.05/70.61 = 31.79/x
  3. Step 3: Cross multiply
    47.05x = 70.61 × 31.79
  4. Step 4: Simplify right side
    47.05x = 2,244.71
  5. Step 5: Solve for x
    x = 2,244.71/47.05
  6. Step 6: Final answer
    x = 47.71

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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.