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Finding the Fourth Proportional to 855.90, 1,283.94 and 307.92

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Solution

The fourth proportional to 855.90, 1,283.94 and 307.92 is: 461.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.90 : 1,283.94 = 307.92 : x
  2. Step 2: Convert to fraction form
    855.90/1,283.94 = 307.92/x
  3. Step 3: Cross multiply
    855.90x = 1,283.94 × 307.92
  4. Step 4: Simplify right side
    855.90x = 395,350.80
  5. Step 5: Solve for x
    x = 395,350.80/855.90
  6. Step 6: Final answer
    x = 461.91

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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.