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Finding the Fourth Proportional to 1,268.80, 1,903.20 and 1,220.20

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Solution

The fourth proportional to 1,268.80, 1,903.20 and 1,220.20 is: 1,830.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.80 : 1,903.20 = 1,220.20 : x
  2. Step 2: Convert to fraction form
    1,268.80/1,903.20 = 1,220.20/x
  3. Step 3: Cross multiply
    1,268.80x = 1,903.20 × 1,220.20
  4. Step 4: Simplify right side
    1,268.80x = 2,322,284.64
  5. Step 5: Solve for x
    x = 2,322,284.64/1,268.80
  6. Step 6: Final answer
    x = 1,830.30

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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.