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Finding the Fourth Proportional to 70.66, 105.99 and 47.87

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Solution

The fourth proportional to 70.66, 105.99 and 47.87 is: 71.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.66 : 105.99 = 47.87 : x
  2. Step 2: Convert to fraction form
    70.66/105.99 = 47.87/x
  3. Step 3: Cross multiply
    70.66x = 105.99 × 47.87
  4. Step 4: Simplify right side
    70.66x = 5,073.74
  5. Step 5: Solve for x
    x = 5,073.74/70.66
  6. Step 6: Final answer
    x = 71.81

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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.