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Finding the Fourth Proportional to 564.50, 779.01 and 315.80

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Solution

The fourth proportional to 564.50, 779.01 and 315.80 is: 435.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.50 : 779.01 = 315.80 : x
  2. Step 2: Convert to fraction form
    564.50/779.01 = 315.80/x
  3. Step 3: Cross multiply
    564.50x = 779.01 × 315.80
  4. Step 4: Simplify right side
    564.50x = 246,011.36
  5. Step 5: Solve for x
    x = 246,011.36/564.50
  6. Step 6: Final answer
    x = 435.80

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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.