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Finding the Fourth Proportional to 381.25, 526.06 and 215.45

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Solution

The fourth proportional to 381.25, 526.06 and 215.45 is: 297.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.25 : 526.06 = 215.45 : x
  2. Step 2: Convert to fraction form
    381.25/526.06 = 215.45/x
  3. Step 3: Cross multiply
    381.25x = 526.06 × 215.45
  4. Step 4: Simplify right side
    381.25x = 113,339.63
  5. Step 5: Solve for x
    x = 113,339.63/381.25
  6. Step 6: Final answer
    x = 297.28

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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.