Home / 3,619.20-5,428.80-1,021.80

Finding the Fourth Proportional to 3,619.20, 5,428.80 and 1,021.80

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Solution

The fourth proportional to 3,619.20, 5,428.80 and 1,021.80 is: 1,532.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,619.20 : 5,428.80 = 1,021.80 : x
  2. Step 2: Convert to fraction form
    3,619.20/5,428.80 = 1,021.80/x
  3. Step 3: Cross multiply
    3,619.20x = 5,428.80 × 1,021.80
  4. Step 4: Simplify right side
    3,619.20x = 5,547,147.84
  5. Step 5: Solve for x
    x = 5,547,147.84/3,619.20
  6. Step 6: Final answer
    x = 1,532.70

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1.5x scale

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.