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Finding the Fourth Proportional to 919.45, 1,269.43 and 720.53

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Solution

The fourth proportional to 919.45, 1,269.43 and 720.53 is: 994.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.45 : 1,269.43 = 720.53 : x
  2. Step 2: Convert to fraction form
    919.45/1,269.43 = 720.53/x
  3. Step 3: Cross multiply
    919.45x = 1,269.43 × 720.53
  4. Step 4: Simplify right side
    919.45x = 914,662.40
  5. Step 5: Solve for x
    x = 914,662.40/919.45
  6. Step 6: Final answer
    x = 994.79

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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.