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Finding the Fourth Proportional to 381.14, 526.01 and 215.40

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Solution

The fourth proportional to 381.14, 526.01 and 215.40 is: 297.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.14 : 526.01 = 215.40 : x
  2. Step 2: Convert to fraction form
    381.14/526.01 = 215.40/x
  3. Step 3: Cross multiply
    381.14x = 526.01 × 215.40
  4. Step 4: Simplify right side
    381.14x = 113,301.48
  5. Step 5: Solve for x
    x = 113,301.48/381.14
  6. Step 6: Final answer
    x = 297.27

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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.