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Finding the Fourth Proportional to 777.94, 1,071.46 and 719.54

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Solution

The fourth proportional to 777.94, 1,071.46 and 719.54 is: 991.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.94 : 1,071.46 = 719.54 : x
  2. Step 2: Convert to fraction form
    777.94/1,071.46 = 719.54/x
  3. Step 3: Cross multiply
    777.94x = 1,071.46 × 719.54
  4. Step 4: Simplify right side
    777.94x = 770,958.33
  5. Step 5: Solve for x
    x = 770,958.33/777.94
  6. Step 6: Final answer
    x = 991.03

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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.