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Finding the Fourth Proportional to 991.08, 1,368.76 and 772.64

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Solution

The fourth proportional to 991.08, 1,368.76 and 772.64 is: 1,067.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.08 : 1,368.76 = 772.64 : x
  2. Step 2: Convert to fraction form
    991.08/1,368.76 = 772.64/x
  3. Step 3: Cross multiply
    991.08x = 1,368.76 × 772.64
  4. Step 4: Simplify right side
    991.08x = 1,057,558.73
  5. Step 5: Solve for x
    x = 1,057,558.73/991.08
  6. Step 6: Final answer
    x = 1,067.08

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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.