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Finding the Fourth Proportional to 102.94, 141.92 and 91.86

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Solution

The fourth proportional to 102.94, 141.92 and 91.86 is: 126.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.94 : 141.92 = 91.86 : x
  2. Step 2: Convert to fraction form
    102.94/141.92 = 91.86/x
  3. Step 3: Cross multiply
    102.94x = 141.92 × 91.86
  4. Step 4: Simplify right side
    102.94x = 13,036.77
  5. Step 5: Solve for x
    x = 13,036.77/102.94
  6. Step 6: Final answer
    x = 126.64

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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.