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Finding the Fourth Proportional to 413.71, 621.25 and 345.76

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Solution

The fourth proportional to 413.71, 621.25 and 345.76 is: 519.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.71 : 621.25 = 345.76 : x
  2. Step 2: Convert to fraction form
    413.71/621.25 = 345.76/x
  3. Step 3: Cross multiply
    413.71x = 621.25 × 345.76
  4. Step 4: Simplify right side
    413.71x = 214,800.98
  5. Step 5: Solve for x
    x = 214,800.98/413.71
  6. Step 6: Final answer
    x = 519.21

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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.