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Finding the Fourth Proportional to 94.40, 141.45 and 91.06

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Solution

The fourth proportional to 94.40, 141.45 and 91.06 is: 136.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.40 : 141.45 = 91.06 : x
  2. Step 2: Convert to fraction form
    94.40/141.45 = 91.06/x
  3. Step 3: Cross multiply
    94.40x = 141.45 × 91.06
  4. Step 4: Simplify right side
    94.40x = 12,879.74
  5. Step 5: Solve for x
    x = 12,879.74/94.40
  6. Step 6: Final answer
    x = 136.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.