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Finding the Fourth Proportional to 393.19, 590.05 and 136.69

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Solution

The fourth proportional to 393.19, 590.05 and 136.69 is: 205.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.19 : 590.05 = 136.69 : x
  2. Step 2: Convert to fraction form
    393.19/590.05 = 136.69/x
  3. Step 3: Cross multiply
    393.19x = 590.05 × 136.69
  4. Step 4: Simplify right side
    393.19x = 80,652.63
  5. Step 5: Solve for x
    x = 80,652.63/393.19
  6. Step 6: Final answer
    x = 205.13

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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.