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Finding the Fourth Proportional to 786.28, 1,173.36 and 720.05

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Solution

The fourth proportional to 786.28, 1,173.36 and 720.05 is: 1,074.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.28 : 1,173.36 = 720.05 : x
  2. Step 2: Convert to fraction form
    786.28/1,173.36 = 720.05/x
  3. Step 3: Cross multiply
    786.28x = 1,173.36 × 720.05
  4. Step 4: Simplify right side
    786.28x = 844,877.87
  5. Step 5: Solve for x
    x = 844,877.87/786.28
  6. Step 6: Final answer
    x = 1,074.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.