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Finding the Fourth Proportional to 881.32, 1,321.98 and 425

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Solution

The fourth proportional to 881.32, 1,321.98 and 425 is: 637.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.32 : 1,321.98 = 425 : x
  2. Step 2: Convert to fraction form
    881.32/1,321.98 = 425/x
  3. Step 3: Cross multiply
    881.32x = 1,321.98 × 425
  4. Step 4: Simplify right side
    881.32x = 561,841.50
  5. Step 5: Solve for x
    x = 561,841.50/881.32
  6. Step 6: Final answer
    x = 637.50

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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.