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Finding the Fourth Proportional to 290.17, 435.53 and 208.63

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Solution

The fourth proportional to 290.17, 435.53 and 208.63 is: 313.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.17 : 435.53 = 208.63 : x
  2. Step 2: Convert to fraction form
    290.17/435.53 = 208.63/x
  3. Step 3: Cross multiply
    290.17x = 435.53 × 208.63
  4. Step 4: Simplify right side
    290.17x = 90,864.62
  5. Step 5: Solve for x
    x = 90,864.62/290.17
  6. Step 6: Final answer
    x = 313.14

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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.