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Finding the Fourth Proportional to 381.59, 526.53 and 215.78

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Solution

The fourth proportional to 381.59, 526.53 and 215.78 is: 297.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.59 : 526.53 = 215.78 : x
  2. Step 2: Convert to fraction form
    381.59/526.53 = 215.78/x
  3. Step 3: Cross multiply
    381.59x = 526.53 × 215.78
  4. Step 4: Simplify right side
    381.59x = 113,614.64
  5. Step 5: Solve for x
    x = 113,614.64/381.59
  6. Step 6: Final answer
    x = 297.74

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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.