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Finding the Fourth Proportional to 427.60, 641.02 and 208.10

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Solution

The fourth proportional to 427.60, 641.02 and 208.10 is: 311.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.60 : 641.02 = 208.10 : x
  2. Step 2: Convert to fraction form
    427.60/641.02 = 208.10/x
  3. Step 3: Cross multiply
    427.60x = 641.02 × 208.10
  4. Step 4: Simplify right side
    427.60x = 133,397.34
  5. Step 5: Solve for x
    x = 133,397.34/427.60
  6. Step 6: Final answer
    x = 311.97

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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.