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Finding the Fourth Proportional to 475.49, 655.79 and 309.57

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Solution

The fourth proportional to 475.49, 655.79 and 309.57 is: 426.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.49 : 655.79 = 309.57 : x
  2. Step 2: Convert to fraction form
    475.49/655.79 = 309.57/x
  3. Step 3: Cross multiply
    475.49x = 655.79 × 309.57
  4. Step 4: Simplify right side
    475.49x = 203,011.36
  5. Step 5: Solve for x
    x = 203,011.36/475.49
  6. Step 6: Final answer
    x = 426.96

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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.