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Finding the Fourth Proportional to 141.95, 212.60 and 138.91

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Solution

The fourth proportional to 141.95, 212.60 and 138.91 is: 208.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.95 : 212.60 = 138.91 : x
  2. Step 2: Convert to fraction form
    141.95/212.60 = 138.91/x
  3. Step 3: Cross multiply
    141.95x = 212.60 × 138.91
  4. Step 4: Simplify right side
    141.95x = 29,532.27
  5. Step 5: Solve for x
    x = 29,532.27/141.95
  6. Step 6: Final answer
    x = 208.05

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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.