Home / 1,641.28-2,264.88-1,220.80

Finding the Fourth Proportional to 1,641.28, 2,264.88 and 1,220.80

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Solution

The fourth proportional to 1,641.28, 2,264.88 and 1,220.80 is: 1,684.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,641.28 : 2,264.88 = 1,220.80 : x
  2. Step 2: Convert to fraction form
    1,641.28/2,264.88 = 1,220.80/x
  3. Step 3: Cross multiply
    1,641.28x = 2,264.88 × 1,220.80
  4. Step 4: Simplify right side
    1,641.28x = 2,764,965.50
  5. Step 5: Solve for x
    x = 2,764,965.50/1,641.28
  6. Step 6: Final answer
    x = 1,684.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.