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Finding the Fourth Proportional to 275.64, 380.58 and 220.68

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Solution

The fourth proportional to 275.64, 380.58 and 220.68 is: 304.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.64 : 380.58 = 220.68 : x
  2. Step 2: Convert to fraction form
    275.64/380.58 = 220.68/x
  3. Step 3: Cross multiply
    275.64x = 380.58 × 220.68
  4. Step 4: Simplify right side
    275.64x = 83,986.39
  5. Step 5: Solve for x
    x = 83,986.39/275.64
  6. Step 6: Final answer
    x = 304.70

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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.