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Finding the Fourth Proportional to 617.90, 925.33 and 386.44

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Solution

The fourth proportional to 617.90, 925.33 and 386.44 is: 578.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.90 : 925.33 = 386.44 : x
  2. Step 2: Convert to fraction form
    617.90/925.33 = 386.44/x
  3. Step 3: Cross multiply
    617.90x = 925.33 × 386.44
  4. Step 4: Simplify right side
    617.90x = 357,584.53
  5. Step 5: Solve for x
    x = 357,584.53/617.90
  6. Step 6: Final answer
    x = 578.71

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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.