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Finding the Fourth Proportional to 141.32, 194.91 and 99.87

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Solution

The fourth proportional to 141.32, 194.91 and 99.87 is: 137.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.32 : 194.91 = 99.87 : x
  2. Step 2: Convert to fraction form
    141.32/194.91 = 99.87/x
  3. Step 3: Cross multiply
    141.32x = 194.91 × 99.87
  4. Step 4: Simplify right side
    141.32x = 19,465.66
  5. Step 5: Solve for x
    x = 19,465.66/141.32
  6. Step 6: Final answer
    x = 137.75

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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.