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Finding the Fourth Proportional to 94.12, 128.93 and 91.72

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Solution

The fourth proportional to 94.12, 128.93 and 91.72 is: 125.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.12 : 128.93 = 91.72 : x
  2. Step 2: Convert to fraction form
    94.12/128.93 = 91.72/x
  3. Step 3: Cross multiply
    94.12x = 128.93 × 91.72
  4. Step 4: Simplify right side
    94.12x = 11,825.46
  5. Step 5: Solve for x
    x = 11,825.46/94.12
  6. Step 6: Final answer
    x = 125.64

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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.