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Finding the Fourth Proportional to 559.90, 772.65 and 311.21

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Solution

The fourth proportional to 559.90, 772.65 and 311.21 is: 429.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.90 : 772.65 = 311.21 : x
  2. Step 2: Convert to fraction form
    559.90/772.65 = 311.21/x
  3. Step 3: Cross multiply
    559.90x = 772.65 × 311.21
  4. Step 4: Simplify right side
    559.90x = 240,450.99
  5. Step 5: Solve for x
    x = 240,450.99/559.90
  6. Step 6: Final answer
    x = 429.46

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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.