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Finding the Fourth Proportional to 521.39, 782.49 and 359.39

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Solution

The fourth proportional to 521.39, 782.49 and 359.39 is: 539.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.39 : 782.49 = 359.39 : x
  2. Step 2: Convert to fraction form
    521.39/782.49 = 359.39/x
  3. Step 3: Cross multiply
    521.39x = 782.49 × 359.39
  4. Step 4: Simplify right side
    521.39x = 281,219.08
  5. Step 5: Solve for x
    x = 281,219.08/521.39
  6. Step 6: Final answer
    x = 539.36

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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.