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Finding the Fourth Proportional to 47.35, 70.89 and 38.80

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Solution

The fourth proportional to 47.35, 70.89 and 38.80 is: 58.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.35 : 70.89 = 38.80 : x
  2. Step 2: Convert to fraction form
    47.35/70.89 = 38.80/x
  3. Step 3: Cross multiply
    47.35x = 70.89 × 38.80
  4. Step 4: Simplify right side
    47.35x = 2,750.53
  5. Step 5: Solve for x
    x = 2,750.53/47.35
  6. Step 6: Final answer
    x = 58.09

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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.