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Finding the Fourth Proportional to 782.87, 1,171.76 and 521.78

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Solution

The fourth proportional to 782.87, 1,171.76 and 521.78 is: 780.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.87 : 1,171.76 = 521.78 : x
  2. Step 2: Convert to fraction form
    782.87/1,171.76 = 521.78/x
  3. Step 3: Cross multiply
    782.87x = 1,171.76 × 521.78
  4. Step 4: Simplify right side
    782.87x = 611,392.47
  5. Step 5: Solve for x
    x = 611,392.47/782.87
  6. Step 6: Final answer
    x = 780.97

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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.