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Finding the Fourth Proportional to 148.50, 222.81 and 128.46

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Solution

The fourth proportional to 148.50, 222.81 and 128.46 is: 192.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.50 : 222.81 = 128.46 : x
  2. Step 2: Convert to fraction form
    148.50/222.81 = 128.46/x
  3. Step 3: Cross multiply
    148.50x = 222.81 × 128.46
  4. Step 4: Simplify right side
    148.50x = 28,622.17
  5. Step 5: Solve for x
    x = 28,622.17/148.50
  6. Step 6: Final answer
    x = 192.74

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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.