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Finding the Fourth Proportional to 881.31, 1,322.15 and 419.61

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Solution

The fourth proportional to 881.31, 1,322.15 and 419.61 is: 629.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.31 : 1,322.15 = 419.61 : x
  2. Step 2: Convert to fraction form
    881.31/1,322.15 = 419.61/x
  3. Step 3: Cross multiply
    881.31x = 1,322.15 × 419.61
  4. Step 4: Simplify right side
    881.31x = 554,787.36
  5. Step 5: Solve for x
    x = 554,787.36/881.31
  6. Step 6: Final answer
    x = 629.50

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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.