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Finding the Fourth Proportional to 558.78, 771.13 and 310.11

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Solution

The fourth proportional to 558.78, 771.13 and 310.11 is: 427.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.78 : 771.13 = 310.11 : x
  2. Step 2: Convert to fraction form
    558.78/771.13 = 310.11/x
  3. Step 3: Cross multiply
    558.78x = 771.13 × 310.11
  4. Step 4: Simplify right side
    558.78x = 239,135.12
  5. Step 5: Solve for x
    x = 239,135.12/558.78
  6. Step 6: Final answer
    x = 427.96

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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.