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Finding the Fourth Proportional to 381.42, 526.12 and 231.98

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Solution

The fourth proportional to 381.42, 526.12 and 231.98 is: 319.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.42 : 526.12 = 231.98 : x
  2. Step 2: Convert to fraction form
    381.42/526.12 = 231.98/x
  3. Step 3: Cross multiply
    381.42x = 526.12 × 231.98
  4. Step 4: Simplify right side
    381.42x = 122,049.32
  5. Step 5: Solve for x
    x = 122,049.32/381.42
  6. Step 6: Final answer
    x = 319.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.