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Finding the Fourth Proportional to 381.17, 525.99 and 215.42

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Solution

The fourth proportional to 381.17, 525.99 and 215.42 is: 297.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.17 : 525.99 = 215.42 : x
  2. Step 2: Convert to fraction form
    381.17/525.99 = 215.42/x
  3. Step 3: Cross multiply
    381.17x = 525.99 × 215.42
  4. Step 4: Simplify right side
    381.17x = 113,307.60
  5. Step 5: Solve for x
    x = 113,307.60/381.17
  6. Step 6: Final answer
    x = 297.26

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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.