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Finding the Fourth Proportional to 991, 1,367.57 and 548.88

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Solution

The fourth proportional to 991, 1,367.57 and 548.88 is: 757.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    991 : 1,367.57 = 548.88 : x
  2. Step 2: Convert to fraction form
    991/1,367.57 = 548.88/x
  3. Step 3: Cross multiply
    991x = 1,367.57 × 548.88
  4. Step 4: Simplify right side
    991x = 750,631.82
  5. Step 5: Solve for x
    x = 750,631.82/991
  6. Step 6: Final answer
    x = 757.45

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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.