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Finding the Fourth Proportional to 1,320.45, 1,980.70 and 396.02

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Solution

The fourth proportional to 1,320.45, 1,980.70 and 396.02 is: 594.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.45 : 1,980.70 = 396.02 : x
  2. Step 2: Convert to fraction form
    1,320.45/1,980.70 = 396.02/x
  3. Step 3: Cross multiply
    1,320.45x = 1,980.70 × 396.02
  4. Step 4: Simplify right side
    1,320.45x = 784,396.81
  5. Step 5: Solve for x
    x = 784,396.81/1,320.45
  6. Step 6: Final answer
    x = 594.04

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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.