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Finding the Fourth Proportional to 1,009.81, 1,393.56 and 611.54

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Solution

The fourth proportional to 1,009.81, 1,393.56 and 611.54 is: 843.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.81 : 1,393.56 = 611.54 : x
  2. Step 2: Convert to fraction form
    1,009.81/1,393.56 = 611.54/x
  3. Step 3: Cross multiply
    1,009.81x = 1,393.56 × 611.54
  4. Step 4: Simplify right side
    1,009.81x = 852,221.58
  5. Step 5: Solve for x
    x = 852,221.58/1,009.81
  6. Step 6: Final answer
    x = 843.94

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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.