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Finding the Fourth Proportional to 251.17, 346.65 and 209.66

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Solution

The fourth proportional to 251.17, 346.65 and 209.66 is: 289.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.17 : 346.65 = 209.66 : x
  2. Step 2: Convert to fraction form
    251.17/346.65 = 209.66/x
  3. Step 3: Cross multiply
    251.17x = 346.65 × 209.66
  4. Step 4: Simplify right side
    251.17x = 72,676.12
  5. Step 5: Solve for x
    x = 72,676.12/251.17
  6. Step 6: Final answer
    x = 289.35

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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.