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Finding the Fourth Proportional to 1,173.54, 1,761.75 and 778.56

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Solution

The fourth proportional to 1,173.54, 1,761.75 and 778.56 is: 1,168.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.54 : 1,761.75 = 778.56 : x
  2. Step 2: Convert to fraction form
    1,173.54/1,761.75 = 778.56/x
  3. Step 3: Cross multiply
    1,173.54x = 1,761.75 × 778.56
  4. Step 4: Simplify right side
    1,173.54x = 1,371,631.38
  5. Step 5: Solve for x
    x = 1,371,631.38/1,173.54
  6. Step 6: Final answer
    x = 1,168.80

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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.