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Finding the Fourth Proportional to 128.24, 177.00 and 88.89

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Solution

The fourth proportional to 128.24, 177.00 and 88.89 is: 122.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.24 : 177.00 = 88.89 : x
  2. Step 2: Convert to fraction form
    128.24/177.00 = 88.89/x
  3. Step 3: Cross multiply
    128.24x = 177.00 × 88.89
  4. Step 4: Simplify right side
    128.24x = 15,732.20
  5. Step 5: Solve for x
    x = 15,732.20/128.24
  6. Step 6: Final answer
    x = 122.68

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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.