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Finding the Fourth Proportional to 281.08, 387.30 and 207.31

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Solution

The fourth proportional to 281.08, 387.30 and 207.31 is: 285.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.08 : 387.30 = 207.31 : x
  2. Step 2: Convert to fraction form
    281.08/387.30 = 207.31/x
  3. Step 3: Cross multiply
    281.08x = 387.30 × 207.31
  4. Step 4: Simplify right side
    281.08x = 80,291.16
  5. Step 5: Solve for x
    x = 80,291.16/281.08
  6. Step 6: Final answer
    x = 285.65

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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.