Home / 1,320.40-1,975.20-1,190.80

Finding the Fourth Proportional to 1,320.40, 1,975.20 and 1,190.80

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Solution

The fourth proportional to 1,320.40, 1,975.20 and 1,190.80 is: 1,781.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.40 : 1,975.20 = 1,190.80 : x
  2. Step 2: Convert to fraction form
    1,320.40/1,975.20 = 1,190.80/x
  3. Step 3: Cross multiply
    1,320.40x = 1,975.20 × 1,190.80
  4. Step 4: Simplify right side
    1,320.40x = 2,352,068.16
  5. Step 5: Solve for x
    x = 2,352,068.16/1,320.40
  6. Step 6: Final answer
    x = 1,781.33

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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.