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Finding the Fourth Proportional to 140.83, 211.26 and 86.63

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Solution

The fourth proportional to 140.83, 211.26 and 86.63 is: 129.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.83 : 211.26 = 86.63 : x
  2. Step 2: Convert to fraction form
    140.83/211.26 = 86.63/x
  3. Step 3: Cross multiply
    140.83x = 211.26 × 86.63
  4. Step 4: Simplify right side
    140.83x = 18,301.45
  5. Step 5: Solve for x
    x = 18,301.45/140.83
  6. Step 6: Final answer
    x = 129.95

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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.