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Finding the Fourth Proportional to 558.72, 839.01 and 419.91

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Solution

The fourth proportional to 558.72, 839.01 and 419.91 is: 630.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.72 : 839.01 = 419.91 : x
  2. Step 2: Convert to fraction form
    558.72/839.01 = 419.91/x
  3. Step 3: Cross multiply
    558.72x = 839.01 × 419.91
  4. Step 4: Simplify right side
    558.72x = 352,308.69
  5. Step 5: Solve for x
    x = 352,308.69/558.72
  6. Step 6: Final answer
    x = 630.56

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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.