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Finding the Fourth Proportional to 1,086.62, 1,630.22 and 393.35

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Solution

The fourth proportional to 1,086.62, 1,630.22 and 393.35 is: 590.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.62 : 1,630.22 = 393.35 : x
  2. Step 2: Convert to fraction form
    1,086.62/1,630.22 = 393.35/x
  3. Step 3: Cross multiply
    1,086.62x = 1,630.22 × 393.35
  4. Step 4: Simplify right side
    1,086.62x = 641,236.92
  5. Step 5: Solve for x
    x = 641,236.92/1,086.62
  6. Step 6: Final answer
    x = 590.12

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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.