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Finding the Fourth Proportional to 289.09, 435.31 and 208.50

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Solution

The fourth proportional to 289.09, 435.31 and 208.50 is: 313.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.09 : 435.31 = 208.50 : x
  2. Step 2: Convert to fraction form
    289.09/435.31 = 208.50/x
  3. Step 3: Cross multiply
    289.09x = 435.31 × 208.50
  4. Step 4: Simplify right side
    289.09x = 90,762.14
  5. Step 5: Solve for x
    x = 90,762.14/289.09
  6. Step 6: Final answer
    x = 313.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.