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Finding the Fourth Proportional to 855.43, 1,283.84 and 485.47

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Solution

The fourth proportional to 855.43, 1,283.84 and 485.47 is: 728.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.43 : 1,283.84 = 485.47 : x
  2. Step 2: Convert to fraction form
    855.43/1,283.84 = 485.47/x
  3. Step 3: Cross multiply
    855.43x = 1,283.84 × 485.47
  4. Step 4: Simplify right side
    855.43x = 623,265.80
  5. Step 5: Solve for x
    x = 623,265.80/855.43
  6. Step 6: Final answer
    x = 728.60

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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.