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Finding the Fourth Proportional to 218.90, 301.90 and 145.19

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Solution

The fourth proportional to 218.90, 301.90 and 145.19 is: 200.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.90 : 301.90 = 145.19 : x
  2. Step 2: Convert to fraction form
    218.90/301.90 = 145.19/x
  3. Step 3: Cross multiply
    218.90x = 301.90 × 145.19
  4. Step 4: Simplify right side
    218.90x = 43,832.86
  5. Step 5: Solve for x
    x = 43,832.86/218.90
  6. Step 6: Final answer
    x = 200.24

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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.