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Finding the Fourth Proportional to 141.40, 210.43 and 139.96

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Solution

The fourth proportional to 141.40, 210.43 and 139.96 is: 208.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.40 : 210.43 = 139.96 : x
  2. Step 2: Convert to fraction form
    141.40/210.43 = 139.96/x
  3. Step 3: Cross multiply
    141.40x = 210.43 × 139.96
  4. Step 4: Simplify right side
    141.40x = 29,451.78
  5. Step 5: Solve for x
    x = 29,451.78/141.40
  6. Step 6: Final answer
    x = 208.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.