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Finding the Fourth Proportional to 141.90, 213.90 and 139.74

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Solution

The fourth proportional to 141.90, 213.90 and 139.74 is: 210.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.90 : 213.90 = 139.74 : x
  2. Step 2: Convert to fraction form
    141.90/213.90 = 139.74/x
  3. Step 3: Cross multiply
    141.90x = 213.90 × 139.74
  4. Step 4: Simplify right side
    141.90x = 29,890.39
  5. Step 5: Solve for x
    x = 29,890.39/141.90
  6. Step 6: Final answer
    x = 210.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.