Home / 1,280.80-1,918.32-1,253.44

Finding the Fourth Proportional to 1,280.80, 1,918.32 and 1,253.44

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Solution

The fourth proportional to 1,280.80, 1,918.32 and 1,253.44 is: 1,877.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.80 : 1,918.32 = 1,253.44 : x
  2. Step 2: Convert to fraction form
    1,280.80/1,918.32 = 1,253.44/x
  3. Step 3: Cross multiply
    1,280.80x = 1,918.32 × 1,253.44
  4. Step 4: Simplify right side
    1,280.80x = 2,404,499.02
  5. Step 5: Solve for x
    x = 2,404,499.02/1,280.80
  6. Step 6: Final answer
    x = 1,877.34

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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.