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Finding the Fourth Proportional to 286.34, 431.22 and 260.42

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Solution

The fourth proportional to 286.34, 431.22 and 260.42 is: 392.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.34 : 431.22 = 260.42 : x
  2. Step 2: Convert to fraction form
    286.34/431.22 = 260.42/x
  3. Step 3: Cross multiply
    286.34x = 431.22 × 260.42
  4. Step 4: Simplify right side
    286.34x = 112,297.13
  5. Step 5: Solve for x
    x = 112,297.13/286.34
  6. Step 6: Final answer
    x = 392.19

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.