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Finding the Fourth Proportional to 389.25, 579.45 and 371.55

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Solution

The fourth proportional to 389.25, 579.45 and 371.55 is: 553.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.25 : 579.45 = 371.55 : x
  2. Step 2: Convert to fraction form
    389.25/579.45 = 371.55/x
  3. Step 3: Cross multiply
    389.25x = 579.45 × 371.55
  4. Step 4: Simplify right side
    389.25x = 215,294.65
  5. Step 5: Solve for x
    x = 215,294.65/389.25
  6. Step 6: Final answer
    x = 553.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.