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Finding the Fourth Proportional to 381.90, 526.96 and 216.09

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Solution

The fourth proportional to 381.90, 526.96 and 216.09 is: 298.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.90 : 526.96 = 216.09 : x
  2. Step 2: Convert to fraction form
    381.90/526.96 = 216.09/x
  3. Step 3: Cross multiply
    381.90x = 526.96 × 216.09
  4. Step 4: Simplify right side
    381.90x = 113,870.79
  5. Step 5: Solve for x
    x = 113,870.79/381.90
  6. Step 6: Final answer
    x = 298.17

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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.