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Finding the Fourth Proportional to 210.03, 289.87 and 122.68

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Solution

The fourth proportional to 210.03, 289.87 and 122.68 is: 169.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.03 : 289.87 = 122.68 : x
  2. Step 2: Convert to fraction form
    210.03/289.87 = 122.68/x
  3. Step 3: Cross multiply
    210.03x = 289.87 × 122.68
  4. Step 4: Simplify right side
    210.03x = 35,561.31
  5. Step 5: Solve for x
    x = 35,561.31/210.03
  6. Step 6: Final answer
    x = 169.32

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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.