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Finding the Fourth Proportional to 475.26, 655.74 and 288.74

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Solution

The fourth proportional to 475.26, 655.74 and 288.74 is: 398.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.26 : 655.74 = 288.74 : x
  2. Step 2: Convert to fraction form
    475.26/655.74 = 288.74/x
  3. Step 3: Cross multiply
    475.26x = 655.74 × 288.74
  4. Step 4: Simplify right side
    475.26x = 189,338.37
  5. Step 5: Solve for x
    x = 189,338.37/475.26
  6. Step 6: Final answer
    x = 398.39

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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.