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Finding the Fourth Proportional to 379.95, 569.97 and 215.43

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Solution

The fourth proportional to 379.95, 569.97 and 215.43 is: 323.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.95 : 569.97 = 215.43 : x
  2. Step 2: Convert to fraction form
    379.95/569.97 = 215.43/x
  3. Step 3: Cross multiply
    379.95x = 569.97 × 215.43
  4. Step 4: Simplify right side
    379.95x = 122,788.64
  5. Step 5: Solve for x
    x = 122,788.64/379.95
  6. Step 6: Final answer
    x = 323.17

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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.