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Finding the Fourth Proportional to 559.80, 772.48 and 311.11

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Solution

The fourth proportional to 559.80, 772.48 and 311.11 is: 429.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.80 : 772.48 = 311.11 : x
  2. Step 2: Convert to fraction form
    559.80/772.48 = 311.11/x
  3. Step 3: Cross multiply
    559.80x = 772.48 × 311.11
  4. Step 4: Simplify right side
    559.80x = 240,320.83
  5. Step 5: Solve for x
    x = 240,320.83/559.80
  6. Step 6: Final answer
    x = 429.30

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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.