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Finding the Fourth Proportional to 290.08, 435.56 and 209.40

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Solution

The fourth proportional to 290.08, 435.56 and 209.40 is: 314.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.08 : 435.56 = 209.40 : x
  2. Step 2: Convert to fraction form
    290.08/435.56 = 209.40/x
  3. Step 3: Cross multiply
    290.08x = 435.56 × 209.40
  4. Step 4: Simplify right side
    290.08x = 91,206.26
  5. Step 5: Solve for x
    x = 91,206.26/290.08
  6. Step 6: Final answer
    x = 314.42

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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.