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Finding the Fourth Proportional to 558.79, 771.12 and 310.08

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Solution

The fourth proportional to 558.79, 771.12 and 310.08 is: 427.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.79 : 771.12 = 310.08 : x
  2. Step 2: Convert to fraction form
    558.79/771.12 = 310.08/x
  3. Step 3: Cross multiply
    558.79x = 771.12 × 310.08
  4. Step 4: Simplify right side
    558.79x = 239,108.89
  5. Step 5: Solve for x
    x = 239,108.89/558.79
  6. Step 6: Final answer
    x = 427.90

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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.