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Finding the Fourth Proportional to 991.88, 1,362.65 and 888.32

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Solution

The fourth proportional to 991.88, 1,362.65 and 888.32 is: 1,220.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.88 : 1,362.65 = 888.32 : x
  2. Step 2: Convert to fraction form
    991.88/1,362.65 = 888.32/x
  3. Step 3: Cross multiply
    991.88x = 1,362.65 × 888.32
  4. Step 4: Simplify right side
    991.88x = 1,210,469.25
  5. Step 5: Solve for x
    x = 1,210,469.25/991.88
  6. Step 6: Final answer
    x = 1,220.38

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.