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Finding the Fourth Proportional to 908.78, 1,363.17 and 388.34

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Solution

The fourth proportional to 908.78, 1,363.17 and 388.34 is: 582.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.78 : 1,363.17 = 388.34 : x
  2. Step 2: Convert to fraction form
    908.78/1,363.17 = 388.34/x
  3. Step 3: Cross multiply
    908.78x = 1,363.17 × 388.34
  4. Step 4: Simplify right side
    908.78x = 529,374.90
  5. Step 5: Solve for x
    x = 529,374.90/908.78
  6. Step 6: Final answer
    x = 582.51

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.