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Finding the Fourth Proportional to 47.05, 70.63 and 31.87

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Solution

The fourth proportional to 47.05, 70.63 and 31.87 is: 47.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.05 : 70.63 = 31.87 : x
  2. Step 2: Convert to fraction form
    47.05/70.63 = 31.87/x
  3. Step 3: Cross multiply
    47.05x = 70.63 × 31.87
  4. Step 4: Simplify right side
    47.05x = 2,250.98
  5. Step 5: Solve for x
    x = 2,250.98/47.05
  6. Step 6: Final answer
    x = 47.84

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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.