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Finding the Fourth Proportional to 475.25, 655.42 and 309.31

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Solution

The fourth proportional to 475.25, 655.42 and 309.31 is: 426.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.25 : 655.42 = 309.31 : x
  2. Step 2: Convert to fraction form
    475.25/655.42 = 309.31/x
  3. Step 3: Cross multiply
    475.25x = 655.42 × 309.31
  4. Step 4: Simplify right side
    475.25x = 202,727.96
  5. Step 5: Solve for x
    x = 202,727.96/475.25
  6. Step 6: Final answer
    x = 426.57

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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.