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Finding the Fourth Proportional to 991.81, 1,367.89 and 618.07

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Solution

The fourth proportional to 991.81, 1,367.89 and 618.07 is: 852.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.81 : 1,367.89 = 618.07 : x
  2. Step 2: Convert to fraction form
    991.81/1,367.89 = 618.07/x
  3. Step 3: Cross multiply
    991.81x = 1,367.89 × 618.07
  4. Step 4: Simplify right side
    991.81x = 845,451.77
  5. Step 5: Solve for x
    x = 845,451.77/991.81
  6. Step 6: Final answer
    x = 852.43

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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.