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Finding the Fourth Proportional to 991.77, 1,367.78 and 618.36

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Solution

The fourth proportional to 991.77, 1,367.78 and 618.36 is: 852.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.77 : 1,367.78 = 618.36 : x
  2. Step 2: Convert to fraction form
    991.77/1,367.78 = 618.36/x
  3. Step 3: Cross multiply
    991.77x = 1,367.78 × 618.36
  4. Step 4: Simplify right side
    991.77x = 845,780.44
  5. Step 5: Solve for x
    x = 845,780.44/991.77
  6. Step 6: Final answer
    x = 852.80

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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.