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Finding the Fourth Proportional to 559.56, 772.13 and 310.81

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Solution

The fourth proportional to 559.56, 772.13 and 310.81 is: 428.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.56 : 772.13 = 310.81 : x
  2. Step 2: Convert to fraction form
    559.56/772.13 = 310.81/x
  3. Step 3: Cross multiply
    559.56x = 772.13 × 310.81
  4. Step 4: Simplify right side
    559.56x = 239,985.73
  5. Step 5: Solve for x
    x = 239,985.73/559.56
  6. Step 6: Final answer
    x = 428.88

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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.