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Finding the Fourth Proportional to 380.70, 569.79 and 218.34

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Solution

The fourth proportional to 380.70, 569.79 and 218.34 is: 326.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.70 : 569.79 = 218.34 : x
  2. Step 2: Convert to fraction form
    380.70/569.79 = 218.34/x
  3. Step 3: Cross multiply
    380.70x = 569.79 × 218.34
  4. Step 4: Simplify right side
    380.70x = 124,407.95
  5. Step 5: Solve for x
    x = 124,407.95/380.70
  6. Step 6: Final answer
    x = 326.79

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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.