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Finding the Fourth Proportional to 1.98, 2.99 and 1.69

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Solution

The fourth proportional to 1.98, 2.99 and 1.69 is: 2.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.98 : 2.99 = 1.69 : x
  2. Step 2: Convert to fraction form
    1.98/2.99 = 1.69/x
  3. Step 3: Cross multiply
    1.98x = 2.99 × 1.69
  4. Step 4: Simplify right side
    1.98x = 5.04
  5. Step 5: Solve for x
    x = 5.04/1.98
  6. Step 6: Final answer
    x = 2.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.