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Finding the Fourth Proportional to 392.21, 588.40 and 148.74

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Solution

The fourth proportional to 392.21, 588.40 and 148.74 is: 223.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.21 : 588.40 = 148.74 : x
  2. Step 2: Convert to fraction form
    392.21/588.40 = 148.74/x
  3. Step 3: Cross multiply
    392.21x = 588.40 × 148.74
  4. Step 4: Simplify right side
    392.21x = 87,516.04
  5. Step 5: Solve for x
    x = 87,516.04/392.21
  6. Step 6: Final answer
    x = 223.14

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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.