Home / 841.20-1,261.82-321.46

Finding the Fourth Proportional to 841.20, 1,261.82 and 321.46

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Solution

The fourth proportional to 841.20, 1,261.82 and 321.46 is: 482.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.20 : 1,261.82 = 321.46 : x
  2. Step 2: Convert to fraction form
    841.20/1,261.82 = 321.46/x
  3. Step 3: Cross multiply
    841.20x = 1,261.82 × 321.46
  4. Step 4: Simplify right side
    841.20x = 405,624.66
  5. Step 5: Solve for x
    x = 405,624.66/841.20
  6. Step 6: Final answer
    x = 482.20

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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.