Home / 1,280.72-1,921.44-459.02

Finding the Fourth Proportional to 1,280.72, 1,921.44 and 459.02

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Solution

The fourth proportional to 1,280.72, 1,921.44 and 459.02 is: 688.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.72 : 1,921.44 = 459.02 : x
  2. Step 2: Convert to fraction form
    1,280.72/1,921.44 = 459.02/x
  3. Step 3: Cross multiply
    1,280.72x = 1,921.44 × 459.02
  4. Step 4: Simplify right side
    1,280.72x = 881,979.39
  5. Step 5: Solve for x
    x = 881,979.39/1,280.72
  6. Step 6: Final answer
    x = 688.66

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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.