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Finding the Fourth Proportional to 314.48, 434.06 and 209.69

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Solution

The fourth proportional to 314.48, 434.06 and 209.69 is: 289.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.48 : 434.06 = 209.69 : x
  2. Step 2: Convert to fraction form
    314.48/434.06 = 209.69/x
  3. Step 3: Cross multiply
    314.48x = 434.06 × 209.69
  4. Step 4: Simplify right side
    314.48x = 91,017.24
  5. Step 5: Solve for x
    x = 91,017.24/314.48
  6. Step 6: Final answer
    x = 289.42

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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.