Home / 1,420.88-2,128.64-1,268.40

Finding the Fourth Proportional to 1,420.88, 2,128.64 and 1,268.40

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Solution

The fourth proportional to 1,420.88, 2,128.64 and 1,268.40 is: 1,900.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.88 : 2,128.64 = 1,268.40 : x
  2. Step 2: Convert to fraction form
    1,420.88/2,128.64 = 1,268.40/x
  3. Step 3: Cross multiply
    1,420.88x = 2,128.64 × 1,268.40
  4. Step 4: Simplify right side
    1,420.88x = 2,699,966.98
  5. Step 5: Solve for x
    x = 2,699,966.98/1,420.88
  6. Step 6: Final answer
    x = 1,900.21

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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.