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Finding the Fourth Proportional to 930.44, 1,393.61 and 911.76

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Solution

The fourth proportional to 930.44, 1,393.61 and 911.76 is: 1,365.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.44 : 1,393.61 = 911.76 : x
  2. Step 2: Convert to fraction form
    930.44/1,393.61 = 911.76/x
  3. Step 3: Cross multiply
    930.44x = 1,393.61 × 911.76
  4. Step 4: Simplify right side
    930.44x = 1,270,628.07
  5. Step 5: Solve for x
    x = 1,270,628.07/930.44
  6. Step 6: Final answer
    x = 1,365.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.