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Finding the Fourth Proportional to 558.77, 771.13 and 310.12

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Solution

The fourth proportional to 558.77, 771.13 and 310.12 is: 427.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.77 : 771.13 = 310.12 : x
  2. Step 2: Convert to fraction form
    558.77/771.13 = 310.12/x
  3. Step 3: Cross multiply
    558.77x = 771.13 × 310.12
  4. Step 4: Simplify right side
    558.77x = 239,142.84
  5. Step 5: Solve for x
    x = 239,142.84/558.77
  6. Step 6: Final answer
    x = 427.98

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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.