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Finding the Fourth Proportional to 94.90, 131.01 and 83.16

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Solution

The fourth proportional to 94.90, 131.01 and 83.16 is: 114.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.90 : 131.01 = 83.16 : x
  2. Step 2: Convert to fraction form
    94.90/131.01 = 83.16/x
  3. Step 3: Cross multiply
    94.90x = 131.01 × 83.16
  4. Step 4: Simplify right side
    94.90x = 10,894.79
  5. Step 5: Solve for x
    x = 10,894.79/94.90
  6. Step 6: Final answer
    x = 114.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.