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Finding the Fourth Proportional to 218.62, 301.63 and 139.88

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Solution

The fourth proportional to 218.62, 301.63 and 139.88 is: 192.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.62 : 301.63 = 139.88 : x
  2. Step 2: Convert to fraction form
    218.62/301.63 = 139.88/x
  3. Step 3: Cross multiply
    218.62x = 301.63 × 139.88
  4. Step 4: Simplify right side
    218.62x = 42,189.80
  5. Step 5: Solve for x
    x = 42,189.80/218.62
  6. Step 6: Final answer
    x = 192.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.