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Finding the Fourth Proportional to 940, 1,296 and 771.33

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Solution

The fourth proportional to 940, 1,296 and 771.33 is: 1,063.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    940 : 1,296 = 771.33 : x
  2. Step 2: Convert to fraction form
    940/1,296 = 771.33/x
  3. Step 3: Cross multiply
    940x = 1,296 × 771.33
  4. Step 4: Simplify right side
    940x = 999,643.68
  5. Step 5: Solve for x
    x = 999,643.68/940
  6. Step 6: Final answer
    x = 1,063.45

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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.