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Finding the Fourth Proportional to 94.20, 140.46 and 86.16

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Solution

The fourth proportional to 94.20, 140.46 and 86.16 is: 128.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.20 : 140.46 = 86.16 : x
  2. Step 2: Convert to fraction form
    94.20/140.46 = 86.16/x
  3. Step 3: Cross multiply
    94.20x = 140.46 × 86.16
  4. Step 4: Simplify right side
    94.20x = 12,102.03
  5. Step 5: Solve for x
    x = 12,102.03/94.20
  6. Step 6: Final answer
    x = 128.47

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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.