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Finding the Fourth Proportional to 475.70, 712.20 and 427.10

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Solution

The fourth proportional to 475.70, 712.20 and 427.10 is: 639.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.70 : 712.20 = 427.10 : x
  2. Step 2: Convert to fraction form
    475.70/712.20 = 427.10/x
  3. Step 3: Cross multiply
    475.70x = 712.20 × 427.10
  4. Step 4: Simplify right side
    475.70x = 304,180.62
  5. Step 5: Solve for x
    x = 304,180.62/475.70
  6. Step 6: Final answer
    x = 639.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.