Home / 2,013.80-3,020.70-1,320.80

Finding the Fourth Proportional to 2,013.80, 3,020.70 and 1,320.80

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Solution

The fourth proportional to 2,013.80, 3,020.70 and 1,320.80 is: 1,981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,013.80 : 3,020.70 = 1,320.80 : x
  2. Step 2: Convert to fraction form
    2,013.80/3,020.70 = 1,320.80/x
  3. Step 3: Cross multiply
    2,013.80x = 3,020.70 × 1,320.80
  4. Step 4: Simplify right side
    2,013.80x = 3,989,740.56
  5. Step 5: Solve for x
    x = 3,989,740.56/2,013.80
  6. Step 6: Final answer
    x = 1,981.20

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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.