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Finding the Fourth Proportional to 281.24, 388.15 and 207.77

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Solution

The fourth proportional to 281.24, 388.15 and 207.77 is: 286.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.24 : 388.15 = 207.77 : x
  2. Step 2: Convert to fraction form
    281.24/388.15 = 207.77/x
  3. Step 3: Cross multiply
    281.24x = 388.15 × 207.77
  4. Step 4: Simplify right side
    281.24x = 80,644.24
  5. Step 5: Solve for x
    x = 80,644.24/281.24
  6. Step 6: Final answer
    x = 286.75

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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.