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Finding the Fourth Proportional to 778.52, 1,071.15 and 680.51

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Solution

The fourth proportional to 778.52, 1,071.15 and 680.51 is: 936.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.52 : 1,071.15 = 680.51 : x
  2. Step 2: Convert to fraction form
    778.52/1,071.15 = 680.51/x
  3. Step 3: Cross multiply
    778.52x = 1,071.15 × 680.51
  4. Step 4: Simplify right side
    778.52x = 728,928.29
  5. Step 5: Solve for x
    x = 728,928.29/778.52
  6. Step 6: Final answer
    x = 936.30

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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.