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Finding the Fourth Proportional to 391.99, 588 and 148.51

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Solution

The fourth proportional to 391.99, 588 and 148.51 is: 222.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.99 : 588 = 148.51 : x
  2. Step 2: Convert to fraction form
    391.99/588 = 148.51/x
  3. Step 3: Cross multiply
    391.99x = 588 × 148.51
  4. Step 4: Simplify right side
    391.99x = 87,323.88
  5. Step 5: Solve for x
    x = 87,323.88/391.99
  6. Step 6: Final answer
    x = 222.77

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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.