Home / 1,321.25-1,981.88-396.81

Finding the Fourth Proportional to 1,321.25, 1,981.88 and 396.81

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Solution

The fourth proportional to 1,321.25, 1,981.88 and 396.81 is: 595.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.25 : 1,981.88 = 396.81 : x
  2. Step 2: Convert to fraction form
    1,321.25/1,981.88 = 396.81/x
  3. Step 3: Cross multiply
    1,321.25x = 1,981.88 × 396.81
  4. Step 4: Simplify right side
    1,321.25x = 786,427.82
  5. Step 5: Solve for x
    x = 786,427.82/1,321.25
  6. Step 6: Final answer
    x = 595.22

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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.