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Finding the Fourth Proportional to 558.88, 771.30 and 310.28

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Solution

The fourth proportional to 558.88, 771.30 and 310.28 is: 428.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.88 : 771.30 = 310.28 : x
  2. Step 2: Convert to fraction form
    558.88/771.30 = 310.28/x
  3. Step 3: Cross multiply
    558.88x = 771.30 × 310.28
  4. Step 4: Simplify right side
    558.88x = 239,315.11
  5. Step 5: Solve for x
    x = 239,315.11/558.88
  6. Step 6: Final answer
    x = 428.21

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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.