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Finding the Fourth Proportional to 381.66, 526.67 and 257.31

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Solution

The fourth proportional to 381.66, 526.67 and 257.31 is: 355.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.66 : 526.67 = 257.31 : x
  2. Step 2: Convert to fraction form
    381.66/526.67 = 257.31/x
  3. Step 3: Cross multiply
    381.66x = 526.67 × 257.31
  4. Step 4: Simplify right side
    381.66x = 135,516.17
  5. Step 5: Solve for x
    x = 135,516.17/381.66
  6. Step 6: Final answer
    x = 355.07

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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.