Home / 1,280.52-1,921.50-511.08

Finding the Fourth Proportional to 1,280.52, 1,921.50 and 511.08

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Solution

The fourth proportional to 1,280.52, 1,921.50 and 511.08 is: 766.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.52 : 1,921.50 = 511.08 : x
  2. Step 2: Convert to fraction form
    1,280.52/1,921.50 = 511.08/x
  3. Step 3: Cross multiply
    1,280.52x = 1,921.50 × 511.08
  4. Step 4: Simplify right side
    1,280.52x = 982,040.22
  5. Step 5: Solve for x
    x = 982,040.22/1,280.52
  6. Step 6: Final answer
    x = 766.91

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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.