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Finding the Fourth Proportional to 1,330.40, 1,995.20 and 550.38

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Solution

The fourth proportional to 1,330.40, 1,995.20 and 550.38 is: 825.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.40 : 1,995.20 = 550.38 : x
  2. Step 2: Convert to fraction form
    1,330.40/1,995.20 = 550.38/x
  3. Step 3: Cross multiply
    1,330.40x = 1,995.20 × 550.38
  4. Step 4: Simplify right side
    1,330.40x = 1,098,118.18
  5. Step 5: Solve for x
    x = 1,098,118.18/1,330.40
  6. Step 6: Final answer
    x = 825.40

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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.