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Finding the Fourth Proportional to 148.85, 204.56 and 139.67

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Solution

The fourth proportional to 148.85, 204.56 and 139.67 is: 191.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.85 : 204.56 = 139.67 : x
  2. Step 2: Convert to fraction form
    148.85/204.56 = 139.67/x
  3. Step 3: Cross multiply
    148.85x = 204.56 × 139.67
  4. Step 4: Simplify right side
    148.85x = 28,570.22
  5. Step 5: Solve for x
    x = 28,570.22/148.85
  6. Step 6: Final answer
    x = 191.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.