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Finding the Fourth Proportional to 218.39, 301.22 and 139.64

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Solution

The fourth proportional to 218.39, 301.22 and 139.64 is: 192.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.39 : 301.22 = 139.64 : x
  2. Step 2: Convert to fraction form
    218.39/301.22 = 139.64/x
  3. Step 3: Cross multiply
    218.39x = 301.22 × 139.64
  4. Step 4: Simplify right side
    218.39x = 42,060.16
  5. Step 5: Solve for x
    x = 42,060.16/218.39
  6. Step 6: Final answer
    x = 192.60

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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.