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Finding the Fourth Proportional to 445.70, 667.80 and 291.39

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Solution

The fourth proportional to 445.70, 667.80 and 291.39 is: 436.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.70 : 667.80 = 291.39 : x
  2. Step 2: Convert to fraction form
    445.70/667.80 = 291.39/x
  3. Step 3: Cross multiply
    445.70x = 667.80 × 291.39
  4. Step 4: Simplify right side
    445.70x = 194,590.24
  5. Step 5: Solve for x
    x = 194,590.24/445.70
  6. Step 6: Final answer
    x = 436.60

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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.