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Finding the Fourth Proportional to 210.20, 290.08 and 122.86

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Solution

The fourth proportional to 210.20, 290.08 and 122.86 is: 169.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.20 : 290.08 = 122.86 : x
  2. Step 2: Convert to fraction form
    210.20/290.08 = 122.86/x
  3. Step 3: Cross multiply
    210.20x = 290.08 × 122.86
  4. Step 4: Simplify right side
    210.20x = 35,639.23
  5. Step 5: Solve for x
    x = 35,639.23/210.20
  6. Step 6: Final answer
    x = 169.55

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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.