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Finding the Fourth Proportional to 1,280.88, 1,920.65 and 550.13

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Solution

The fourth proportional to 1,280.88, 1,920.65 and 550.13 is: 824.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.88 : 1,920.65 = 550.13 : x
  2. Step 2: Convert to fraction form
    1,280.88/1,920.65 = 550.13/x
  3. Step 3: Cross multiply
    1,280.88x = 1,920.65 × 550.13
  4. Step 4: Simplify right side
    1,280.88x = 1,056,594.83
  5. Step 5: Solve for x
    x = 1,056,594.83/1,280.88
  6. Step 6: Final answer
    x = 824.90

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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.