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Finding the Fourth Proportional to 1,320.45, 1,980.69 and 396.06

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Solution

The fourth proportional to 1,320.45, 1,980.69 and 396.06 is: 594.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.45 : 1,980.69 = 396.06 : x
  2. Step 2: Convert to fraction form
    1,320.45/1,980.69 = 396.06/x
  3. Step 3: Cross multiply
    1,320.45x = 1,980.69 × 396.06
  4. Step 4: Simplify right side
    1,320.45x = 784,472.08
  5. Step 5: Solve for x
    x = 784,472.08/1,320.45
  6. Step 6: Final answer
    x = 594.09

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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.