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Finding the Fourth Proportional to 521.49, 782.39 and 247.21

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Solution

The fourth proportional to 521.49, 782.39 and 247.21 is: 370.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.49 : 782.39 = 247.21 : x
  2. Step 2: Convert to fraction form
    521.49/782.39 = 247.21/x
  3. Step 3: Cross multiply
    521.49x = 782.39 × 247.21
  4. Step 4: Simplify right side
    521.49x = 193,413.29
  5. Step 5: Solve for x
    x = 193,413.29/521.49
  6. Step 6: Final answer
    x = 370.88

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Double scale
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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.