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Finding the Fourth Proportional to 855.47, 1,282.80 and 307.64

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Solution

The fourth proportional to 855.47, 1,282.80 and 307.64 is: 461.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.47 : 1,282.80 = 307.64 : x
  2. Step 2: Convert to fraction form
    855.47/1,282.80 = 307.64/x
  3. Step 3: Cross multiply
    855.47x = 1,282.80 × 307.64
  4. Step 4: Simplify right side
    855.47x = 394,640.59
  5. Step 5: Solve for x
    x = 394,640.59/855.47
  6. Step 6: Final answer
    x = 461.31

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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.