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Finding the Fourth Proportional to 218.58, 301.54 and 139.86

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Solution

The fourth proportional to 218.58, 301.54 and 139.86 is: 192.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.58 : 301.54 = 139.86 : x
  2. Step 2: Convert to fraction form
    218.58/301.54 = 139.86/x
  3. Step 3: Cross multiply
    218.58x = 301.54 × 139.86
  4. Step 4: Simplify right side
    218.58x = 42,173.03
  5. Step 5: Solve for x
    x = 42,173.03/218.58
  6. Step 6: Final answer
    x = 192.94

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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.