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Finding the Fourth Proportional to 522.80, 784.20 and 413.45

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Solution

The fourth proportional to 522.80, 784.20 and 413.45 is: 620.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.80 : 784.20 = 413.45 : x
  2. Step 2: Convert to fraction form
    522.80/784.20 = 413.45/x
  3. Step 3: Cross multiply
    522.80x = 784.20 × 413.45
  4. Step 4: Simplify right side
    522.80x = 324,227.49
  5. Step 5: Solve for x
    x = 324,227.49/522.80
  6. Step 6: Final answer
    x = 620.18

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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.