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Finding the Fourth Proportional to 94.19, 140.52 and 86.36

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Solution

The fourth proportional to 94.19, 140.52 and 86.36 is: 128.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.19 : 140.52 = 86.36 : x
  2. Step 2: Convert to fraction form
    94.19/140.52 = 86.36/x
  3. Step 3: Cross multiply
    94.19x = 140.52 × 86.36
  4. Step 4: Simplify right side
    94.19x = 12,134.93
  5. Step 5: Solve for x
    x = 12,134.93/94.19
  6. Step 6: Final answer
    x = 128.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.