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Finding the Fourth Proportional to 218.67, 301.65 and 139.91

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Solution

The fourth proportional to 218.67, 301.65 and 139.91 is: 193.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.67 : 301.65 = 139.91 : x
  2. Step 2: Convert to fraction form
    218.67/301.65 = 139.91/x
  3. Step 3: Cross multiply
    218.67x = 301.65 × 139.91
  4. Step 4: Simplify right side
    218.67x = 42,204.00
  5. Step 5: Solve for x
    x = 42,204.00/218.67
  6. Step 6: Final answer
    x = 193.00

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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.