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Finding the Fourth Proportional to 427.04, 640.60 and 118.90

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Solution

The fourth proportional to 427.04, 640.60 and 118.90 is: 178.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.04 : 640.60 = 118.90 : x
  2. Step 2: Convert to fraction form
    427.04/640.60 = 118.90/x
  3. Step 3: Cross multiply
    427.04x = 640.60 × 118.90
  4. Step 4: Simplify right side
    427.04x = 76,167.34
  5. Step 5: Solve for x
    x = 76,167.34/427.04
  6. Step 6: Final answer
    x = 178.36

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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.