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Finding the Fourth Proportional to 558.36, 836.80 and 427.75

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Solution

The fourth proportional to 558.36, 836.80 and 427.75 is: 641.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.36 : 836.80 = 427.75 : x
  2. Step 2: Convert to fraction form
    558.36/836.80 = 427.75/x
  3. Step 3: Cross multiply
    558.36x = 836.80 × 427.75
  4. Step 4: Simplify right side
    558.36x = 357,938.04
  5. Step 5: Solve for x
    x = 357,938.04/558.36
  6. Step 6: Final answer
    x = 641.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.