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Finding the Fourth Proportional to 778.08, 1,071.72 and 622.56

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Solution

The fourth proportional to 778.08, 1,071.72 and 622.56 is: 857.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.08 : 1,071.72 = 622.56 : x
  2. Step 2: Convert to fraction form
    778.08/1,071.72 = 622.56/x
  3. Step 3: Cross multiply
    778.08x = 1,071.72 × 622.56
  4. Step 4: Simplify right side
    778.08x = 667,210.00
  5. Step 5: Solve for x
    x = 667,210.00/778.08
  6. Step 6: Final answer
    x = 857.51

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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.