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Finding the Fourth Proportional to 475.12, 655.44 and 309.32

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Solution

The fourth proportional to 475.12, 655.44 and 309.32 is: 426.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.12 : 655.44 = 309.32 : x
  2. Step 2: Convert to fraction form
    475.12/655.44 = 309.32/x
  3. Step 3: Cross multiply
    475.12x = 655.44 × 309.32
  4. Step 4: Simplify right side
    475.12x = 202,740.70
  5. Step 5: Solve for x
    x = 202,740.70/475.12
  6. Step 6: Final answer
    x = 426.71

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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.