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Finding the Fourth Proportional to 381.71, 526.74 and 215.90

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Solution

The fourth proportional to 381.71, 526.74 and 215.90 is: 297.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.71 : 526.74 = 215.90 : x
  2. Step 2: Convert to fraction form
    381.71/526.74 = 215.90/x
  3. Step 3: Cross multiply
    381.71x = 526.74 × 215.90
  4. Step 4: Simplify right side
    381.71x = 113,721.70
  5. Step 5: Solve for x
    x = 113,721.70/381.71
  6. Step 6: Final answer
    x = 297.93

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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.