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Finding the Fourth Proportional to 381, 570.90 and 265.20

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Solution

The fourth proportional to 381, 570.90 and 265.20 is: 397.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    381 : 570.90 = 265.20 : x
  2. Step 2: Convert to fraction form
    381/570.90 = 265.20/x
  3. Step 3: Cross multiply
    381x = 570.90 × 265.20
  4. Step 4: Simplify right side
    381x = 151,402.68
  5. Step 5: Solve for x
    x = 151,402.68/381
  6. Step 6: Final answer
    x = 397.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.