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Finding the Fourth Proportional to 54.20, 80.90 and 47.35

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Solution

The fourth proportional to 54.20, 80.90 and 47.35 is: 70.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.20 : 80.90 = 47.35 : x
  2. Step 2: Convert to fraction form
    54.20/80.90 = 47.35/x
  3. Step 3: Cross multiply
    54.20x = 80.90 × 47.35
  4. Step 4: Simplify right side
    54.20x = 3,830.66
  5. Step 5: Solve for x
    x = 3,830.66/54.20
  6. Step 6: Final answer
    x = 70.67

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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.