Home / 1,280.07-1,921.19-511.11

Finding the Fourth Proportional to 1,280.07, 1,921.19 and 511.11

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Solution

The fourth proportional to 1,280.07, 1,921.19 and 511.11 is: 767.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.07 : 1,921.19 = 511.11 : x
  2. Step 2: Convert to fraction form
    1,280.07/1,921.19 = 511.11/x
  3. Step 3: Cross multiply
    1,280.07x = 1,921.19 × 511.11
  4. Step 4: Simplify right side
    1,280.07x = 981,936.87
  5. Step 5: Solve for x
    x = 981,936.87/1,280.07
  6. Step 6: Final answer
    x = 767.10

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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.