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Finding the Fourth Proportional to 381.65, 526.71 and 215.87

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Solution

The fourth proportional to 381.65, 526.71 and 215.87 is: 297.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.65 : 526.71 = 215.87 : x
  2. Step 2: Convert to fraction form
    381.65/526.71 = 215.87/x
  3. Step 3: Cross multiply
    381.65x = 526.71 × 215.87
  4. Step 4: Simplify right side
    381.65x = 113,699.30
  5. Step 5: Solve for x
    x = 113,699.30/381.65
  6. Step 6: Final answer
    x = 297.91

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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.