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Finding the Fourth Proportional to 275.84, 380.64 and 217.76

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Solution

The fourth proportional to 275.84, 380.64 and 217.76 is: 300.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.84 : 380.64 = 217.76 : x
  2. Step 2: Convert to fraction form
    275.84/380.64 = 217.76/x
  3. Step 3: Cross multiply
    275.84x = 380.64 × 217.76
  4. Step 4: Simplify right side
    275.84x = 82,888.17
  5. Step 5: Solve for x
    x = 82,888.17/275.84
  6. Step 6: Final answer
    x = 300.49

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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.