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Finding the Fourth Proportional to 230.10, 345.15 and 218.90

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Solution

The fourth proportional to 230.10, 345.15 and 218.90 is: 328.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.10 : 345.15 = 218.90 : x
  2. Step 2: Convert to fraction form
    230.10/345.15 = 218.90/x
  3. Step 3: Cross multiply
    230.10x = 345.15 × 218.90
  4. Step 4: Simplify right side
    230.10x = 75,553.34
  5. Step 5: Solve for x
    x = 75,553.34/230.10
  6. Step 6: Final answer
    x = 328.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.