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Finding the Fourth Proportional to 1,280.97, 1,920.38 and 551.07

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Solution

The fourth proportional to 1,280.97, 1,920.38 and 551.07 is: 826.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.97 : 1,920.38 = 551.07 : x
  2. Step 2: Convert to fraction form
    1,280.97/1,920.38 = 551.07/x
  3. Step 3: Cross multiply
    1,280.97x = 1,920.38 × 551.07
  4. Step 4: Simplify right side
    1,280.97x = 1,058,261.05
  5. Step 5: Solve for x
    x = 1,058,261.05/1,280.97
  6. Step 6: Final answer
    x = 826.14

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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.