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Finding the Fourth Proportional to 1,280.25, 1,920.36 and 847.30

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Solution

The fourth proportional to 1,280.25, 1,920.36 and 847.30 is: 1,270.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.25 : 1,920.36 = 847.30 : x
  2. Step 2: Convert to fraction form
    1,280.25/1,920.36 = 847.30/x
  3. Step 3: Cross multiply
    1,280.25x = 1,920.36 × 847.30
  4. Step 4: Simplify right side
    1,280.25x = 1,627,121.03
  5. Step 5: Solve for x
    x = 1,627,121.03/1,280.25
  6. Step 6: Final answer
    x = 1,270.94

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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.