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Finding the Fourth Proportional to 210.79, 290.68 and 198.64

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Solution

The fourth proportional to 210.79, 290.68 and 198.64 is: 273.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.79 : 290.68 = 198.64 : x
  2. Step 2: Convert to fraction form
    210.79/290.68 = 198.64/x
  3. Step 3: Cross multiply
    210.79x = 290.68 × 198.64
  4. Step 4: Simplify right side
    210.79x = 57,740.68
  5. Step 5: Solve for x
    x = 57,740.68/210.79
  6. Step 6: Final answer
    x = 273.93

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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.