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Finding the Fourth Proportional to 141.98, 211.75 and 139.55

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Solution

The fourth proportional to 141.98, 211.75 and 139.55 is: 208.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.98 : 211.75 = 139.55 : x
  2. Step 2: Convert to fraction form
    141.98/211.75 = 139.55/x
  3. Step 3: Cross multiply
    141.98x = 211.75 × 139.55
  4. Step 4: Simplify right side
    141.98x = 29,549.71
  5. Step 5: Solve for x
    x = 29,549.71/141.98
  6. Step 6: Final answer
    x = 208.13

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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.