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Finding the Fourth Proportional to 919.36, 1,267.66 and 742.24

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Solution

The fourth proportional to 919.36, 1,267.66 and 742.24 is: 1,023.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.36 : 1,267.66 = 742.24 : x
  2. Step 2: Convert to fraction form
    919.36/1,267.66 = 742.24/x
  3. Step 3: Cross multiply
    919.36x = 1,267.66 × 742.24
  4. Step 4: Simplify right side
    919.36x = 940,907.96
  5. Step 5: Solve for x
    x = 940,907.96/919.36
  6. Step 6: Final answer
    x = 1,023.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.