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Finding the Fourth Proportional to 559.12, 771.55 and 310.45

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Solution

The fourth proportional to 559.12, 771.55 and 310.45 is: 428.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.12 : 771.55 = 310.45 : x
  2. Step 2: Convert to fraction form
    559.12/771.55 = 310.45/x
  3. Step 3: Cross multiply
    559.12x = 771.55 × 310.45
  4. Step 4: Simplify right side
    559.12x = 239,527.70
  5. Step 5: Solve for x
    x = 239,527.70/559.12
  6. Step 6: Final answer
    x = 428.40

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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.