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Finding the Fourth Proportional to 275.55, 379.93 and 216.42

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Solution

The fourth proportional to 275.55, 379.93 and 216.42 is: 298.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.55 : 379.93 = 216.42 : x
  2. Step 2: Convert to fraction form
    275.55/379.93 = 216.42/x
  3. Step 3: Cross multiply
    275.55x = 379.93 × 216.42
  4. Step 4: Simplify right side
    275.55x = 82,224.45
  5. Step 5: Solve for x
    x = 82,224.45/275.55
  6. Step 6: Final answer
    x = 298.40

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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.