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Finding the Fourth Proportional to 149.90, 224.90 and 128.28

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Solution

The fourth proportional to 149.90, 224.90 and 128.28 is: 192.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.90 : 224.90 = 128.28 : x
  2. Step 2: Convert to fraction form
    149.90/224.90 = 128.28/x
  3. Step 3: Cross multiply
    149.90x = 224.90 × 128.28
  4. Step 4: Simplify right side
    149.90x = 28,850.17
  5. Step 5: Solve for x
    x = 28,850.17/149.90
  6. Step 6: Final answer
    x = 192.46

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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.