Home / 1,280.42-1,921.97-1,135.10

Finding the Fourth Proportional to 1,280.42, 1,921.97 and 1,135.10

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Solution

The fourth proportional to 1,280.42, 1,921.97 and 1,135.10 is: 1,703.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.42 : 1,921.97 = 1,135.10 : x
  2. Step 2: Convert to fraction form
    1,280.42/1,921.97 = 1,135.10/x
  3. Step 3: Cross multiply
    1,280.42x = 1,921.97 × 1,135.10
  4. Step 4: Simplify right side
    1,280.42x = 2,181,622.47
  5. Step 5: Solve for x
    x = 2,181,622.47/1,280.42
  6. Step 6: Final answer
    x = 1,703.83

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1.5x scale

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.