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Finding the Fourth Proportional to 776.31, 1,072.49 and 579.48

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Solution

The fourth proportional to 776.31, 1,072.49 and 579.48 is: 800.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.31 : 1,072.49 = 579.48 : x
  2. Step 2: Convert to fraction form
    776.31/1,072.49 = 579.48/x
  3. Step 3: Cross multiply
    776.31x = 1,072.49 × 579.48
  4. Step 4: Simplify right side
    776.31x = 621,483.61
  5. Step 5: Solve for x
    x = 621,483.61/776.31
  6. Step 6: Final answer
    x = 800.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.