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Finding the Fourth Proportional to 558.72, 771.08 and 310.05

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Solution

The fourth proportional to 558.72, 771.08 and 310.05 is: 427.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.72 : 771.08 = 310.05 : x
  2. Step 2: Convert to fraction form
    558.72/771.08 = 310.05/x
  3. Step 3: Cross multiply
    558.72x = 771.08 × 310.05
  4. Step 4: Simplify right side
    558.72x = 239,071.80
  5. Step 5: Solve for x
    x = 239,071.80/558.72
  6. Step 6: Final answer
    x = 427.89

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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.