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Finding the Fourth Proportional to 94.11, 128.90 and 88.58

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Solution

The fourth proportional to 94.11, 128.90 and 88.58 is: 121.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.11 : 128.90 = 88.58 : x
  2. Step 2: Convert to fraction form
    94.11/128.90 = 88.58/x
  3. Step 3: Cross multiply
    94.11x = 128.90 × 88.58
  4. Step 4: Simplify right side
    94.11x = 11,417.21
  5. Step 5: Solve for x
    x = 11,417.21/94.11
  6. Step 6: Final answer
    x = 121.32

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.