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Finding the Fourth Proportional to 289.90, 434.16 and 208.48

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Solution

The fourth proportional to 289.90, 434.16 and 208.48 is: 312.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.90 : 434.16 = 208.48 : x
  2. Step 2: Convert to fraction form
    289.90/434.16 = 208.48/x
  3. Step 3: Cross multiply
    289.90x = 434.16 × 208.48
  4. Step 4: Simplify right side
    289.90x = 90,513.68
  5. Step 5: Solve for x
    x = 90,513.68/289.90
  6. Step 6: Final answer
    x = 312.22

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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.