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Finding the Fourth Proportional to 881.50, 1,321.93 and 394.30

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Solution

The fourth proportional to 881.50, 1,321.93 and 394.30 is: 591.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.50 : 1,321.93 = 394.30 : x
  2. Step 2: Convert to fraction form
    881.50/1,321.93 = 394.30/x
  3. Step 3: Cross multiply
    881.50x = 1,321.93 × 394.30
  4. Step 4: Simplify right side
    881.50x = 521,237.00
  5. Step 5: Solve for x
    x = 521,237.00/881.50
  6. Step 6: Final answer
    x = 591.31

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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.