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Finding the Fourth Proportional to 378.16, 566.27 and 215.56

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Solution

The fourth proportional to 378.16, 566.27 and 215.56 is: 322.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.16 : 566.27 = 215.56 : x
  2. Step 2: Convert to fraction form
    378.16/566.27 = 215.56/x
  3. Step 3: Cross multiply
    378.16x = 566.27 × 215.56
  4. Step 4: Simplify right side
    378.16x = 122,062.87
  5. Step 5: Solve for x
    x = 122,062.87/378.16
  6. Step 6: Final answer
    x = 322.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.