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Finding the Fourth Proportional to 559.45, 772.05 and 310.77

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Solution

The fourth proportional to 559.45, 772.05 and 310.77 is: 428.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.45 : 772.05 = 310.77 : x
  2. Step 2: Convert to fraction form
    559.45/772.05 = 310.77/x
  3. Step 3: Cross multiply
    559.45x = 772.05 × 310.77
  4. Step 4: Simplify right side
    559.45x = 239,929.98
  5. Step 5: Solve for x
    x = 239,929.98/559.45
  6. Step 6: Final answer
    x = 428.87

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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.