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Finding the Fourth Proportional to 771.39, 1,071.66 and 764.19

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Solution

The fourth proportional to 771.39, 1,071.66 and 764.19 is: 1,061.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.39 : 1,071.66 = 764.19 : x
  2. Step 2: Convert to fraction form
    771.39/1,071.66 = 764.19/x
  3. Step 3: Cross multiply
    771.39x = 1,071.66 × 764.19
  4. Step 4: Simplify right side
    771.39x = 818,942.68
  5. Step 5: Solve for x
    x = 818,942.68/771.39
  6. Step 6: Final answer
    x = 1,061.65

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.