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Finding the Fourth Proportional to 855.90, 1,285.20 and 626.40

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Solution

The fourth proportional to 855.90, 1,285.20 and 626.40 is: 940.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.90 : 1,285.20 = 626.40 : x
  2. Step 2: Convert to fraction form
    855.90/1,285.20 = 626.40/x
  3. Step 3: Cross multiply
    855.90x = 1,285.20 × 626.40
  4. Step 4: Simplify right side
    855.90x = 805,049.28
  5. Step 5: Solve for x
    x = 805,049.28/855.90
  6. Step 6: Final answer
    x = 940.59

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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.