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Finding the Fourth Proportional to 778.80, 1,161.90 and 735.60

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Solution

The fourth proportional to 778.80, 1,161.90 and 735.60 is: 1,097.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.80 : 1,161.90 = 735.60 : x
  2. Step 2: Convert to fraction form
    778.80/1,161.90 = 735.60/x
  3. Step 3: Cross multiply
    778.80x = 1,161.90 × 735.60
  4. Step 4: Simplify right side
    778.80x = 854,693.64
  5. Step 5: Solve for x
    x = 854,693.64/778.80
  6. Step 6: Final answer
    x = 1,097.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.