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Finding the Fourth Proportional to 782.78, 1,173.11 and 295.56

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Solution

The fourth proportional to 782.78, 1,173.11 and 295.56 is: 442.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.78 : 1,173.11 = 295.56 : x
  2. Step 2: Convert to fraction form
    782.78/1,173.11 = 295.56/x
  3. Step 3: Cross multiply
    782.78x = 1,173.11 × 295.56
  4. Step 4: Simplify right side
    782.78x = 346,722.91
  5. Step 5: Solve for x
    x = 346,722.91/782.78
  6. Step 6: Final answer
    x = 442.94

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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.