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Finding the Fourth Proportional to 381.11, 526.28 and 302.85

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Solution

The fourth proportional to 381.11, 526.28 and 302.85 is: 418.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.11 : 526.28 = 302.85 : x
  2. Step 2: Convert to fraction form
    381.11/526.28 = 302.85/x
  3. Step 3: Cross multiply
    381.11x = 526.28 × 302.85
  4. Step 4: Simplify right side
    381.11x = 159,382.38
  5. Step 5: Solve for x
    x = 159,382.38/381.11
  6. Step 6: Final answer
    x = 418.21

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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.