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Finding the Fourth Proportional to 778.40, 1,166.40 and 622.88

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Solution

The fourth proportional to 778.40, 1,166.40 and 622.88 is: 933.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.40 : 1,166.40 = 622.88 : x
  2. Step 2: Convert to fraction form
    778.40/1,166.40 = 622.88/x
  3. Step 3: Cross multiply
    778.40x = 1,166.40 × 622.88
  4. Step 4: Simplify right side
    778.40x = 726,527.23
  5. Step 5: Solve for x
    x = 726,527.23/778.40
  6. Step 6: Final answer
    x = 933.36

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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.