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Finding the Fourth Proportional to 564.31, 778.55 and 315.57

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Solution

The fourth proportional to 564.31, 778.55 and 315.57 is: 435.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.31 : 778.55 = 315.57 : x
  2. Step 2: Convert to fraction form
    564.31/778.55 = 315.57/x
  3. Step 3: Cross multiply
    564.31x = 778.55 × 315.57
  4. Step 4: Simplify right side
    564.31x = 245,687.02
  5. Step 5: Solve for x
    x = 245,687.02/564.31
  6. Step 6: Final answer
    x = 435.38

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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.