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Finding the Fourth Proportional to 446.60, 669.90 and 138.60

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Solution

The fourth proportional to 446.60, 669.90 and 138.60 is: 207.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    446.60 : 669.90 = 138.60 : x
  2. Step 2: Convert to fraction form
    446.60/669.90 = 138.60/x
  3. Step 3: Cross multiply
    446.60x = 669.90 × 138.60
  4. Step 4: Simplify right side
    446.60x = 92,848.14
  5. Step 5: Solve for x
    x = 92,848.14/446.60
  6. Step 6: Final answer
    x = 207.90

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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.