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Finding the Fourth Proportional to 141.50, 212.26 and 139.70

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Solution

The fourth proportional to 141.50, 212.26 and 139.70 is: 209.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.50 : 212.26 = 139.70 : x
  2. Step 2: Convert to fraction form
    141.50/212.26 = 139.70/x
  3. Step 3: Cross multiply
    141.50x = 212.26 × 139.70
  4. Step 4: Simplify right side
    141.50x = 29,652.72
  5. Step 5: Solve for x
    x = 29,652.72/141.50
  6. Step 6: Final answer
    x = 209.56

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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.