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Finding the Fourth Proportional to 381.76, 526.79 and 257.40

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Solution

The fourth proportional to 381.76, 526.79 and 257.40 is: 355.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.76 : 526.79 = 257.40 : x
  2. Step 2: Convert to fraction form
    381.76/526.79 = 257.40/x
  3. Step 3: Cross multiply
    381.76x = 526.79 × 257.40
  4. Step 4: Simplify right side
    381.76x = 135,595.75
  5. Step 5: Solve for x
    x = 135,595.75/381.76
  6. Step 6: Final answer
    x = 355.19

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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.