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Finding the Fourth Proportional to 2,988, 4,123.38 and 1,661.68

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Solution

The fourth proportional to 2,988, 4,123.38 and 1,661.68 is: 2,293.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,988 : 4,123.38 = 1,661.68 : x
  2. Step 2: Convert to fraction form
    2,988/4,123.38 = 1,661.68/x
  3. Step 3: Cross multiply
    2,988x = 4,123.38 × 1,661.68
  4. Step 4: Simplify right side
    2,988x = 6,851,738.08
  5. Step 5: Solve for x
    x = 6,851,738.08/2,988
  6. Step 6: Final answer
    x = 2,293.09

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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.