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Finding the Fourth Proportional to 141.45, 213.27 and 139.92

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Solution

The fourth proportional to 141.45, 213.27 and 139.92 is: 210.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.45 : 213.27 = 139.92 : x
  2. Step 2: Convert to fraction form
    141.45/213.27 = 139.92/x
  3. Step 3: Cross multiply
    141.45x = 213.27 × 139.92
  4. Step 4: Simplify right side
    141.45x = 29,840.74
  5. Step 5: Solve for x
    x = 29,840.74/141.45
  6. Step 6: Final answer
    x = 210.96

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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.