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Finding the Fourth Proportional to 74.20, 111.30 and 47.11

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Solution

The fourth proportional to 74.20, 111.30 and 47.11 is: 70.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.20 : 111.30 = 47.11 : x
  2. Step 2: Convert to fraction form
    74.20/111.30 = 47.11/x
  3. Step 3: Cross multiply
    74.20x = 111.30 × 47.11
  4. Step 4: Simplify right side
    74.20x = 5,243.34
  5. Step 5: Solve for x
    x = 5,243.34/74.20
  6. Step 6: Final answer
    x = 70.67

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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.