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Finding the Fourth Proportional to 991.10, 1,367.65 and 548.98

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Solution

The fourth proportional to 991.10, 1,367.65 and 548.98 is: 757.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.10 : 1,367.65 = 548.98 : x
  2. Step 2: Convert to fraction form
    991.10/1,367.65 = 548.98/x
  3. Step 3: Cross multiply
    991.10x = 1,367.65 × 548.98
  4. Step 4: Simplify right side
    991.10x = 750,809.76
  5. Step 5: Solve for x
    x = 750,809.76/991.10
  6. Step 6: Final answer
    x = 757.55

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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.