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Finding the Fourth Proportional to 855.36, 1,283.12 and 307.68

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Solution

The fourth proportional to 855.36, 1,283.12 and 307.68 is: 461.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.36 : 1,283.12 = 307.68 : x
  2. Step 2: Convert to fraction form
    855.36/1,283.12 = 307.68/x
  3. Step 3: Cross multiply
    855.36x = 1,283.12 × 307.68
  4. Step 4: Simplify right side
    855.36x = 394,790.36
  5. Step 5: Solve for x
    x = 394,790.36/855.36
  6. Step 6: Final answer
    x = 461.55

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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.