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Finding the Fourth Proportional to 218.31, 301.37 and 139.71

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Solution

The fourth proportional to 218.31, 301.37 and 139.71 is: 192.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.31 : 301.37 = 139.71 : x
  2. Step 2: Convert to fraction form
    218.31/301.37 = 139.71/x
  3. Step 3: Cross multiply
    218.31x = 301.37 × 139.71
  4. Step 4: Simplify right side
    218.31x = 42,104.40
  5. Step 5: Solve for x
    x = 42,104.40/218.31
  6. Step 6: Final answer
    x = 192.87

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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.