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Finding the Fourth Proportional to 881.92, 1,321.16 and 419.04

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Solution

The fourth proportional to 881.92, 1,321.16 and 419.04 is: 627.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.92 : 1,321.16 = 419.04 : x
  2. Step 2: Convert to fraction form
    881.92/1,321.16 = 419.04/x
  3. Step 3: Cross multiply
    881.92x = 1,321.16 × 419.04
  4. Step 4: Simplify right side
    881.92x = 553,618.89
  5. Step 5: Solve for x
    x = 553,618.89/881.92
  6. Step 6: Final answer
    x = 627.74

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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.