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Finding the Fourth Proportional to 445.12, 667.70 and 289.30

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Solution

The fourth proportional to 445.12, 667.70 and 289.30 is: 433.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.12 : 667.70 = 289.30 : x
  2. Step 2: Convert to fraction form
    445.12/667.70 = 289.30/x
  3. Step 3: Cross multiply
    445.12x = 667.70 × 289.30
  4. Step 4: Simplify right side
    445.12x = 193,160.83
  5. Step 5: Solve for x
    x = 193,160.83/445.12
  6. Step 6: Final answer
    x = 433.96

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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.