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Finding the Fourth Proportional to 921.14, 1,380.86 and 400.82

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Solution

The fourth proportional to 921.14, 1,380.86 and 400.82 is: 600.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.14 : 1,380.86 = 400.82 : x
  2. Step 2: Convert to fraction form
    921.14/1,380.86 = 400.82/x
  3. Step 3: Cross multiply
    921.14x = 1,380.86 × 400.82
  4. Step 4: Simplify right side
    921.14x = 553,471.15
  5. Step 5: Solve for x
    x = 553,471.15/921.14
  6. Step 6: Final answer
    x = 600.86

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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.