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Finding the Fourth Proportional to 617.40, 925.86 and 385.95

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Solution

The fourth proportional to 617.40, 925.86 and 385.95 is: 578.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.40 : 925.86 = 385.95 : x
  2. Step 2: Convert to fraction form
    617.40/925.86 = 385.95/x
  3. Step 3: Cross multiply
    617.40x = 925.86 × 385.95
  4. Step 4: Simplify right side
    617.40x = 357,335.67
  5. Step 5: Solve for x
    x = 357,335.67/617.40
  6. Step 6: Final answer
    x = 578.77

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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.