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Finding the Fourth Proportional to 855.20, 1,180.08 and 622.40

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Solution

The fourth proportional to 855.20, 1,180.08 and 622.40 is: 858.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.20 : 1,180.08 = 622.40 : x
  2. Step 2: Convert to fraction form
    855.20/1,180.08 = 622.40/x
  3. Step 3: Cross multiply
    855.20x = 1,180.08 × 622.40
  4. Step 4: Simplify right side
    855.20x = 734,481.79
  5. Step 5: Solve for x
    x = 734,481.79/855.20
  6. Step 6: Final answer
    x = 858.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.