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Finding the Fourth Proportional to 209.55, 312.17 and 203.18

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Solution

The fourth proportional to 209.55, 312.17 and 203.18 is: 302.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.55 : 312.17 = 203.18 : x
  2. Step 2: Convert to fraction form
    209.55/312.17 = 203.18/x
  3. Step 3: Cross multiply
    209.55x = 312.17 × 203.18
  4. Step 4: Simplify right side
    209.55x = 63,424.12
  5. Step 5: Solve for x
    x = 63,424.12/209.55
  6. Step 6: Final answer
    x = 302.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.