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Finding the Fourth Proportional to 94.11, 129.16 and 90.15

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Solution

The fourth proportional to 94.11, 129.16 and 90.15 is: 123.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.11 : 129.16 = 90.15 : x
  2. Step 2: Convert to fraction form
    94.11/129.16 = 90.15/x
  3. Step 3: Cross multiply
    94.11x = 129.16 × 90.15
  4. Step 4: Simplify right side
    94.11x = 11,643.77
  5. Step 5: Solve for x
    x = 11,643.77/94.11
  6. Step 6: Final answer
    x = 123.73

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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.