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Finding the Fourth Proportional to 787.44, 1,181.64 and 685.50

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Solution

The fourth proportional to 787.44, 1,181.64 and 685.50 is: 1,028.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.44 : 1,181.64 = 685.50 : x
  2. Step 2: Convert to fraction form
    787.44/1,181.64 = 685.50/x
  3. Step 3: Cross multiply
    787.44x = 1,181.64 × 685.50
  4. Step 4: Simplify right side
    787.44x = 810,014.22
  5. Step 5: Solve for x
    x = 810,014.22/787.44
  6. Step 6: Final answer
    x = 1,028.67

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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.