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Finding the Fourth Proportional to 678.43, 936.26 and 412.83

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Solution

The fourth proportional to 678.43, 936.26 and 412.83 is: 569.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.43 : 936.26 = 412.83 : x
  2. Step 2: Convert to fraction form
    678.43/936.26 = 412.83/x
  3. Step 3: Cross multiply
    678.43x = 936.26 × 412.83
  4. Step 4: Simplify right side
    678.43x = 386,514.15
  5. Step 5: Solve for x
    x = 386,514.15/678.43
  6. Step 6: Final answer
    x = 569.72

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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.