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Finding the Fourth Proportional to 1,321.05, 1,981.90 and 396.62

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Solution

The fourth proportional to 1,321.05, 1,981.90 and 396.62 is: 595.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.05 : 1,981.90 = 396.62 : x
  2. Step 2: Convert to fraction form
    1,321.05/1,981.90 = 396.62/x
  3. Step 3: Cross multiply
    1,321.05x = 1,981.90 × 396.62
  4. Step 4: Simplify right side
    1,321.05x = 786,061.18
  5. Step 5: Solve for x
    x = 786,061.18/1,321.05
  6. Step 6: Final answer
    x = 595.03

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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.