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Finding the Fourth Proportional to 475.38, 655.56 and 317.97

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Solution

The fourth proportional to 475.38, 655.56 and 317.97 is: 438.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.38 : 655.56 = 317.97 : x
  2. Step 2: Convert to fraction form
    475.38/655.56 = 317.97/x
  3. Step 3: Cross multiply
    475.38x = 655.56 × 317.97
  4. Step 4: Simplify right side
    475.38x = 208,448.41
  5. Step 5: Solve for x
    x = 208,448.41/475.38
  6. Step 6: Final answer
    x = 438.49

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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.