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Finding the Fourth Proportional to 128.03, 176.47 and 88.74

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Solution

The fourth proportional to 128.03, 176.47 and 88.74 is: 122.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.03 : 176.47 = 88.74 : x
  2. Step 2: Convert to fraction form
    128.03/176.47 = 88.74/x
  3. Step 3: Cross multiply
    128.03x = 176.47 × 88.74
  4. Step 4: Simplify right side
    128.03x = 15,660.72
  5. Step 5: Solve for x
    x = 15,660.72/128.03
  6. Step 6: Final answer
    x = 122.32

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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.