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Finding the Fourth Proportional to 380.92, 525.66 and 215.15

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Solution

The fourth proportional to 380.92, 525.66 and 215.15 is: 296.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.92 : 525.66 = 215.15 : x
  2. Step 2: Convert to fraction form
    380.92/525.66 = 215.15/x
  3. Step 3: Cross multiply
    380.92x = 525.66 × 215.15
  4. Step 4: Simplify right side
    380.92x = 113,095.75
  5. Step 5: Solve for x
    x = 113,095.75/380.92
  6. Step 6: Final answer
    x = 296.90

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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.