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Finding the Fourth Proportional to 281.23, 388.29 and 207.70

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Solution

The fourth proportional to 281.23, 388.29 and 207.70 is: 286.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.23 : 388.29 = 207.70 : x
  2. Step 2: Convert to fraction form
    281.23/388.29 = 207.70/x
  3. Step 3: Cross multiply
    281.23x = 388.29 × 207.70
  4. Step 4: Simplify right side
    281.23x = 80,647.83
  5. Step 5: Solve for x
    x = 80,647.83/281.23
  6. Step 6: Final answer
    x = 286.77

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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.