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Finding the Fourth Proportional to 855.87, 1,283.93 and 308.21

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Solution

The fourth proportional to 855.87, 1,283.93 and 308.21 is: 462.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.87 : 1,283.93 = 308.21 : x
  2. Step 2: Convert to fraction form
    855.87/1,283.93 = 308.21/x
  3. Step 3: Cross multiply
    855.87x = 1,283.93 × 308.21
  4. Step 4: Simplify right side
    855.87x = 395,712.10
  5. Step 5: Solve for x
    x = 395,712.10/855.87
  6. Step 6: Final answer
    x = 462.35

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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.