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Finding the Fourth Proportional to 564.67, 779.61 and 355.15

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Solution

The fourth proportional to 564.67, 779.61 and 355.15 is: 490.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.67 : 779.61 = 355.15 : x
  2. Step 2: Convert to fraction form
    564.67/779.61 = 355.15/x
  3. Step 3: Cross multiply
    564.67x = 779.61 × 355.15
  4. Step 4: Simplify right side
    564.67x = 276,878.49
  5. Step 5: Solve for x
    x = 276,878.49/564.67
  6. Step 6: Final answer
    x = 490.34

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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.