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Finding the Fourth Proportional to 47.37, 70.71 and 39.78

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Solution

The fourth proportional to 47.37, 70.71 and 39.78 is: 59.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.37 : 70.71 = 39.78 : x
  2. Step 2: Convert to fraction form
    47.37/70.71 = 39.78/x
  3. Step 3: Cross multiply
    47.37x = 70.71 × 39.78
  4. Step 4: Simplify right side
    47.37x = 2,812.84
  5. Step 5: Solve for x
    x = 2,812.84/47.37
  6. Step 6: Final answer
    x = 59.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.