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Finding the Fourth Proportional to 1,280.20, 1,919.49 and 867.10

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Solution

The fourth proportional to 1,280.20, 1,919.49 and 867.10 is: 1,300.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.20 : 1,919.49 = 867.10 : x
  2. Step 2: Convert to fraction form
    1,280.20/1,919.49 = 867.10/x
  3. Step 3: Cross multiply
    1,280.20x = 1,919.49 × 867.10
  4. Step 4: Simplify right side
    1,280.20x = 1,664,389.78
  5. Step 5: Solve for x
    x = 1,664,389.78/1,280.20
  6. Step 6: Final answer
    x = 1,300.10

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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.