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Finding the Fourth Proportional to 209.18, 313.98 and 122.60

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Solution

The fourth proportional to 209.18, 313.98 and 122.60 is: 184.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.18 : 313.98 = 122.60 : x
  2. Step 2: Convert to fraction form
    209.18/313.98 = 122.60/x
  3. Step 3: Cross multiply
    209.18x = 313.98 × 122.60
  4. Step 4: Simplify right side
    209.18x = 38,492.38
  5. Step 5: Solve for x
    x = 38,492.38/209.18
  6. Step 6: Final answer
    x = 184.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.