Home / 1,280.63-1,921.35-511.13

Finding the Fourth Proportional to 1,280.63, 1,921.35 and 511.13

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Solution

The fourth proportional to 1,280.63, 1,921.35 and 511.13 is: 766.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.63 : 1,921.35 = 511.13 : x
  2. Step 2: Convert to fraction form
    1,280.63/1,921.35 = 511.13/x
  3. Step 3: Cross multiply
    1,280.63x = 1,921.35 × 511.13
  4. Step 4: Simplify right side
    1,280.63x = 982,050.02
  5. Step 5: Solve for x
    x = 982,050.02/1,280.63
  6. Step 6: Final answer
    x = 766.85

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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.