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Finding the Fourth Proportional to 1,280.36, 1,920.33 and 355.79

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Solution

The fourth proportional to 1,280.36, 1,920.33 and 355.79 is: 533.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.36 : 1,920.33 = 355.79 : x
  2. Step 2: Convert to fraction form
    1,280.36/1,920.33 = 355.79/x
  3. Step 3: Cross multiply
    1,280.36x = 1,920.33 × 355.79
  4. Step 4: Simplify right side
    1,280.36x = 683,239.01
  5. Step 5: Solve for x
    x = 683,239.01/1,280.36
  6. Step 6: Final answer
    x = 533.63

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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.