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Finding the Fourth Proportional to 94.19, 129.89 and 61.49

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Solution

The fourth proportional to 94.19, 129.89 and 61.49 is: 84.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.19 : 129.89 = 61.49 : x
  2. Step 2: Convert to fraction form
    94.19/129.89 = 61.49/x
  3. Step 3: Cross multiply
    94.19x = 129.89 × 61.49
  4. Step 4: Simplify right side
    94.19x = 7,986.44
  5. Step 5: Solve for x
    x = 7,986.44/94.19
  6. Step 6: Final answer
    x = 84.80

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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.