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Finding the Fourth Proportional to 389.82, 537.96 and 215.18

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Solution

The fourth proportional to 389.82, 537.96 and 215.18 is: 296.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.82 : 537.96 = 215.18 : x
  2. Step 2: Convert to fraction form
    389.82/537.96 = 215.18/x
  3. Step 3: Cross multiply
    389.82x = 537.96 × 215.18
  4. Step 4: Simplify right side
    389.82x = 115,758.23
  5. Step 5: Solve for x
    x = 115,758.23/389.82
  6. Step 6: Final answer
    x = 296.95

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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.