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Finding the Fourth Proportional to 149.05, 205.23 and 128.29

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Solution

The fourth proportional to 149.05, 205.23 and 128.29 is: 176.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.05 : 205.23 = 128.29 : x
  2. Step 2: Convert to fraction form
    149.05/205.23 = 128.29/x
  3. Step 3: Cross multiply
    149.05x = 205.23 × 128.29
  4. Step 4: Simplify right side
    149.05x = 26,328.96
  5. Step 5: Solve for x
    x = 26,328.96/149.05
  6. Step 6: Final answer
    x = 176.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.