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Finding the Fourth Proportional to 1,320.59, 1,981.22 and 396.17

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Solution

The fourth proportional to 1,320.59, 1,981.22 and 396.17 is: 594.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.59 : 1,981.22 = 396.17 : x
  2. Step 2: Convert to fraction form
    1,320.59/1,981.22 = 396.17/x
  3. Step 3: Cross multiply
    1,320.59x = 1,981.22 × 396.17
  4. Step 4: Simplify right side
    1,320.59x = 784,893.80
  5. Step 5: Solve for x
    x = 784,893.80/1,320.59
  6. Step 6: Final answer
    x = 594.35

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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.