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Finding the Fourth Proportional to 559.88, 772.61 and 311.21

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Solution

The fourth proportional to 559.88, 772.61 and 311.21 is: 429.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.88 : 772.61 = 311.21 : x
  2. Step 2: Convert to fraction form
    559.88/772.61 = 311.21/x
  3. Step 3: Cross multiply
    559.88x = 772.61 × 311.21
  4. Step 4: Simplify right side
    559.88x = 240,438.54
  5. Step 5: Solve for x
    x = 240,438.54/559.88
  6. Step 6: Final answer
    x = 429.45

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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.