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Finding the Fourth Proportional to 474.56, 655.08 and 308.91

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Solution

The fourth proportional to 474.56, 655.08 and 308.91 is: 426.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.56 : 655.08 = 308.91 : x
  2. Step 2: Convert to fraction form
    474.56/655.08 = 308.91/x
  3. Step 3: Cross multiply
    474.56x = 655.08 × 308.91
  4. Step 4: Simplify right side
    474.56x = 202,360.76
  5. Step 5: Solve for x
    x = 202,360.76/474.56
  6. Step 6: Final answer
    x = 426.42

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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.