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Finding the Fourth Proportional to 3,581.12, 5,371.68 and 984.80

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Solution

The fourth proportional to 3,581.12, 5,371.68 and 984.80 is: 1,477.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,581.12 : 5,371.68 = 984.80 : x
  2. Step 2: Convert to fraction form
    3,581.12/5,371.68 = 984.80/x
  3. Step 3: Cross multiply
    3,581.12x = 5,371.68 × 984.80
  4. Step 4: Simplify right side
    3,581.12x = 5,290,030.46
  5. Step 5: Solve for x
    x = 5,290,030.46/3,581.12
  6. Step 6: Final answer
    x = 1,477.20

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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.