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Finding the Fourth Proportional to 393.79, 590.45 and 133.66

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Solution

The fourth proportional to 393.79, 590.45 and 133.66 is: 200.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.79 : 590.45 = 133.66 : x
  2. Step 2: Convert to fraction form
    393.79/590.45 = 133.66/x
  3. Step 3: Cross multiply
    393.79x = 590.45 × 133.66
  4. Step 4: Simplify right side
    393.79x = 78,916.59
  5. Step 5: Solve for x
    x = 78,916.59/393.79
  6. Step 6: Final answer
    x = 200.41

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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.