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Finding the Fourth Proportional to 389.21, 537.08 and 214.55

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Solution

The fourth proportional to 389.21, 537.08 and 214.55 is: 296.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.21 : 537.08 = 214.55 : x
  2. Step 2: Convert to fraction form
    389.21/537.08 = 214.55/x
  3. Step 3: Cross multiply
    389.21x = 537.08 × 214.55
  4. Step 4: Simplify right side
    389.21x = 115,229.98
  5. Step 5: Solve for x
    x = 115,229.98/389.21
  6. Step 6: Final answer
    x = 296.06

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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.