Home / 1,640.80-2,457.60-1,151.20

Finding the Fourth Proportional to 1,640.80, 2,457.60 and 1,151.20

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Solution

The fourth proportional to 1,640.80, 2,457.60 and 1,151.20 is: 1,724.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.80 : 2,457.60 = 1,151.20 : x
  2. Step 2: Convert to fraction form
    1,640.80/2,457.60 = 1,151.20/x
  3. Step 3: Cross multiply
    1,640.80x = 2,457.60 × 1,151.20
  4. Step 4: Simplify right side
    1,640.80x = 2,829,189.12
  5. Step 5: Solve for x
    x = 2,829,189.12/1,640.80
  6. Step 6: Final answer
    x = 1,724.27

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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.