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Finding the Fourth Proportional to 393.90, 590.84 and 105.36

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Solution

The fourth proportional to 393.90, 590.84 and 105.36 is: 158.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.90 : 590.84 = 105.36 : x
  2. Step 2: Convert to fraction form
    393.90/590.84 = 105.36/x
  3. Step 3: Cross multiply
    393.90x = 590.84 × 105.36
  4. Step 4: Simplify right side
    393.90x = 62,250.90
  5. Step 5: Solve for x
    x = 62,250.90/393.90
  6. Step 6: Final answer
    x = 158.04

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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.