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Finding the Fourth Proportional to 70.39, 105.63 and 47.71

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Solution

The fourth proportional to 70.39, 105.63 and 47.71 is: 71.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.39 : 105.63 = 47.71 : x
  2. Step 2: Convert to fraction form
    70.39/105.63 = 47.71/x
  3. Step 3: Cross multiply
    70.39x = 105.63 × 47.71
  4. Step 4: Simplify right side
    70.39x = 5,039.61
  5. Step 5: Solve for x
    x = 5,039.61/70.39
  6. Step 6: Final answer
    x = 71.60

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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.