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Finding the Fourth Proportional to 386.22, 532.98 and 209.18

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Solution

The fourth proportional to 386.22, 532.98 and 209.18 is: 288.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.22 : 532.98 = 209.18 : x
  2. Step 2: Convert to fraction form
    386.22/532.98 = 209.18/x
  3. Step 3: Cross multiply
    386.22x = 532.98 × 209.18
  4. Step 4: Simplify right side
    386.22x = 111,486.90
  5. Step 5: Solve for x
    x = 111,486.90/386.22
  6. Step 6: Final answer
    x = 288.67

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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.