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Finding the Fourth Proportional to 391.99, 588 and 118.06

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Solution

The fourth proportional to 391.99, 588 and 118.06 is: 177.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.99 : 588 = 118.06 : x
  2. Step 2: Convert to fraction form
    391.99/588 = 118.06/x
  3. Step 3: Cross multiply
    391.99x = 588 × 118.06
  4. Step 4: Simplify right side
    391.99x = 69,416.34
  5. Step 5: Solve for x
    x = 69,416.34/391.99
  6. Step 6: Final answer
    x = 177.09

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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.