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Finding the Fourth Proportional to 128.66, 177.33 and 108.98

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Solution

The fourth proportional to 128.66, 177.33 and 108.98 is: 150.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.66 : 177.33 = 108.98 : x
  2. Step 2: Convert to fraction form
    128.66/177.33 = 108.98/x
  3. Step 3: Cross multiply
    128.66x = 177.33 × 108.98
  4. Step 4: Simplify right side
    128.66x = 19,325.42
  5. Step 5: Solve for x
    x = 19,325.42/128.66
  6. Step 6: Final answer
    x = 150.21

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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.