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Finding the Fourth Proportional to 389.30, 537.09 and 271.40

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Solution

The fourth proportional to 389.30, 537.09 and 271.40 is: 374.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.30 : 537.09 = 271.40 : x
  2. Step 2: Convert to fraction form
    389.30/537.09 = 271.40/x
  3. Step 3: Cross multiply
    389.30x = 537.09 × 271.40
  4. Step 4: Simplify right side
    389.30x = 145,766.23
  5. Step 5: Solve for x
    x = 145,766.23/389.30
  6. Step 6: Final answer
    x = 374.43

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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.