Home / 1,280.92-1,921.38-459.24

Finding the Fourth Proportional to 1,280.92, 1,921.38 and 459.24

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Solution

The fourth proportional to 1,280.92, 1,921.38 and 459.24 is: 688.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.92 : 1,921.38 = 459.24 : x
  2. Step 2: Convert to fraction form
    1,280.92/1,921.38 = 459.24/x
  3. Step 3: Cross multiply
    1,280.92x = 1,921.38 × 459.24
  4. Step 4: Simplify right side
    1,280.92x = 882,372.26
  5. Step 5: Solve for x
    x = 882,372.26/1,280.92
  6. Step 6: Final answer
    x = 688.86

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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.