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Finding the Fourth Proportional to 855.66, 1,283.47 and 308.20

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Solution

The fourth proportional to 855.66, 1,283.47 and 308.20 is: 462.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.66 : 1,283.47 = 308.20 : x
  2. Step 2: Convert to fraction form
    855.66/1,283.47 = 308.20/x
  3. Step 3: Cross multiply
    855.66x = 1,283.47 × 308.20
  4. Step 4: Simplify right side
    855.66x = 395,565.45
  5. Step 5: Solve for x
    x = 395,565.45/855.66
  6. Step 6: Final answer
    x = 462.29

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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.