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Finding the Fourth Proportional to 290.88, 436 and 162.72

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Solution

The fourth proportional to 290.88, 436 and 162.72 is: 243.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.88 : 436 = 162.72 : x
  2. Step 2: Convert to fraction form
    290.88/436 = 162.72/x
  3. Step 3: Cross multiply
    290.88x = 436 × 162.72
  4. Step 4: Simplify right side
    290.88x = 70,945.92
  5. Step 5: Solve for x
    x = 70,945.92/290.88
  6. Step 6: Final answer
    x = 243.90

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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.