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Finding the Fourth Proportional to 881.67, 1,321.53 and 388.32

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Solution

The fourth proportional to 881.67, 1,321.53 and 388.32 is: 582.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.67 : 1,321.53 = 388.32 : x
  2. Step 2: Convert to fraction form
    881.67/1,321.53 = 388.32/x
  3. Step 3: Cross multiply
    881.67x = 1,321.53 × 388.32
  4. Step 4: Simplify right side
    881.67x = 513,176.53
  5. Step 5: Solve for x
    x = 513,176.53/881.67
  6. Step 6: Final answer
    x = 582.05

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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.