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Finding the Fourth Proportional to 148.99, 222.41 and 128.71

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Solution

The fourth proportional to 148.99, 222.41 and 128.71 is: 192.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.99 : 222.41 = 128.71 : x
  2. Step 2: Convert to fraction form
    148.99/222.41 = 128.71/x
  3. Step 3: Cross multiply
    148.99x = 222.41 × 128.71
  4. Step 4: Simplify right side
    148.99x = 28,626.39
  5. Step 5: Solve for x
    x = 28,626.39/148.99
  6. Step 6: Final answer
    x = 192.14

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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.