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Finding the Fourth Proportional to 919.54, 1,380.12 and 775.36

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Solution

The fourth proportional to 919.54, 1,380.12 and 775.36 is: 1,163.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.54 : 1,380.12 = 775.36 : x
  2. Step 2: Convert to fraction form
    919.54/1,380.12 = 775.36/x
  3. Step 3: Cross multiply
    919.54x = 1,380.12 × 775.36
  4. Step 4: Simplify right side
    919.54x = 1,070,089.84
  5. Step 5: Solve for x
    x = 1,070,089.84/919.54
  6. Step 6: Final answer
    x = 1,163.72

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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.