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Finding the Fourth Proportional to 558.90, 771.32 and 310.23

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Solution

The fourth proportional to 558.90, 771.32 and 310.23 is: 428.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.90 : 771.32 = 310.23 : x
  2. Step 2: Convert to fraction form
    558.90/771.32 = 310.23/x
  3. Step 3: Cross multiply
    558.90x = 771.32 × 310.23
  4. Step 4: Simplify right side
    558.90x = 239,286.60
  5. Step 5: Solve for x
    x = 239,286.60/558.90
  6. Step 6: Final answer
    x = 428.14

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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.