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Finding the Fourth Proportional to 563.89, 778.24 and 315.31

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Solution

The fourth proportional to 563.89, 778.24 and 315.31 is: 435.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.89 : 778.24 = 315.31 : x
  2. Step 2: Convert to fraction form
    563.89/778.24 = 315.31/x
  3. Step 3: Cross multiply
    563.89x = 778.24 × 315.31
  4. Step 4: Simplify right side
    563.89x = 245,382.96
  5. Step 5: Solve for x
    x = 245,382.96/563.89
  6. Step 6: Final answer
    x = 435.16

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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.