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Finding the Fourth Proportional to 218.88, 328.40 and 206

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Solution

The fourth proportional to 218.88, 328.40 and 206 is: 309.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.88 : 328.40 = 206 : x
  2. Step 2: Convert to fraction form
    218.88/328.40 = 206/x
  3. Step 3: Cross multiply
    218.88x = 328.40 × 206
  4. Step 4: Simplify right side
    218.88x = 67,650.40
  5. Step 5: Solve for x
    x = 67,650.40/218.88
  6. Step 6: Final answer
    x = 309.08

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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.