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Finding the Fourth Proportional to 617.93, 928.79 and 413.81

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Solution

The fourth proportional to 617.93, 928.79 and 413.81 is: 621.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.93 : 928.79 = 413.81 : x
  2. Step 2: Convert to fraction form
    617.93/928.79 = 413.81/x
  3. Step 3: Cross multiply
    617.93x = 928.79 × 413.81
  4. Step 4: Simplify right side
    617.93x = 384,335.88
  5. Step 5: Solve for x
    x = 384,335.88/617.93
  6. Step 6: Final answer
    x = 621.98

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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.