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Finding the Fourth Proportional to 1,280.54, 1,920.58 and 447.71

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Solution

The fourth proportional to 1,280.54, 1,920.58 and 447.71 is: 671.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.54 : 1,920.58 = 447.71 : x
  2. Step 2: Convert to fraction form
    1,280.54/1,920.58 = 447.71/x
  3. Step 3: Cross multiply
    1,280.54x = 1,920.58 × 447.71
  4. Step 4: Simplify right side
    1,280.54x = 859,852.15
  5. Step 5: Solve for x
    x = 859,852.15/1,280.54
  6. Step 6: Final answer
    x = 671.47

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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.