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Finding the Fourth Proportional to 855.72, 1,283.82 and 307.90

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Solution

The fourth proportional to 855.72, 1,283.82 and 307.90 is: 461.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.72 : 1,283.82 = 307.90 : x
  2. Step 2: Convert to fraction form
    855.72/1,283.82 = 307.90/x
  3. Step 3: Cross multiply
    855.72x = 1,283.82 × 307.90
  4. Step 4: Simplify right side
    855.72x = 395,288.18
  5. Step 5: Solve for x
    x = 395,288.18/855.72
  6. Step 6: Final answer
    x = 461.94

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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.