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Finding the Fourth Proportional to 1,280.73, 1,921.08 and 868.85

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Solution

The fourth proportional to 1,280.73, 1,921.08 and 868.85 is: 1,303.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.73 : 1,921.08 = 868.85 : x
  2. Step 2: Convert to fraction form
    1,280.73/1,921.08 = 868.85/x
  3. Step 3: Cross multiply
    1,280.73x = 1,921.08 × 868.85
  4. Step 4: Simplify right side
    1,280.73x = 1,669,120.75
  5. Step 5: Solve for x
    x = 1,669,120.75/1,280.73
  6. Step 6: Final answer
    x = 1,303.26

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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.