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Finding the Fourth Proportional to 559.56, 772.20 and 310.89

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Solution

The fourth proportional to 559.56, 772.20 and 310.89 is: 429.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.56 : 772.20 = 310.89 : x
  2. Step 2: Convert to fraction form
    559.56/772.20 = 310.89/x
  3. Step 3: Cross multiply
    559.56x = 772.20 × 310.89
  4. Step 4: Simplify right side
    559.56x = 240,063.84
  5. Step 5: Solve for x
    x = 240,063.84/559.56
  6. Step 6: Final answer
    x = 429.02

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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.