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Finding the Fourth Proportional to 94.78, 141.14 and 91.58

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Solution

The fourth proportional to 94.78, 141.14 and 91.58 is: 136.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.78 : 141.14 = 91.58 : x
  2. Step 2: Convert to fraction form
    94.78/141.14 = 91.58/x
  3. Step 3: Cross multiply
    94.78x = 141.14 × 91.58
  4. Step 4: Simplify right side
    94.78x = 12,925.60
  5. Step 5: Solve for x
    x = 12,925.60/94.78
  6. Step 6: Final answer
    x = 136.37

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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.