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Finding the Fourth Proportional to 381.07, 525.90 and 215.28

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Solution

The fourth proportional to 381.07, 525.90 and 215.28 is: 297.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.07 : 525.90 = 215.28 : x
  2. Step 2: Convert to fraction form
    381.07/525.90 = 215.28/x
  3. Step 3: Cross multiply
    381.07x = 525.90 × 215.28
  4. Step 4: Simplify right side
    381.07x = 113,215.75
  5. Step 5: Solve for x
    x = 113,215.75/381.07
  6. Step 6: Final answer
    x = 297.10

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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.