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Finding the Fourth Proportional to 275.31, 380.47 and 205.60

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Solution

The fourth proportional to 275.31, 380.47 and 205.60 is: 284.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.31 : 380.47 = 205.60 : x
  2. Step 2: Convert to fraction form
    275.31/380.47 = 205.60/x
  3. Step 3: Cross multiply
    275.31x = 380.47 × 205.60
  4. Step 4: Simplify right side
    275.31x = 78,223.17
  5. Step 5: Solve for x
    x = 78,223.17/275.31
  6. Step 6: Final answer
    x = 284.13

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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.