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Finding the Fourth Proportional to 73.49, 109.99 and 39.20

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Solution

The fourth proportional to 73.49, 109.99 and 39.20 is: 58.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.49 : 109.99 = 39.20 : x
  2. Step 2: Convert to fraction form
    73.49/109.99 = 39.20/x
  3. Step 3: Cross multiply
    73.49x = 109.99 × 39.20
  4. Step 4: Simplify right side
    73.49x = 4,311.61
  5. Step 5: Solve for x
    x = 4,311.61/73.49
  6. Step 6: Final answer
    x = 58.67

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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.