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Finding the Fourth Proportional to 290.80, 436.32 and 98.48

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Solution

The fourth proportional to 290.80, 436.32 and 98.48 is: 147.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.80 : 436.32 = 98.48 : x
  2. Step 2: Convert to fraction form
    290.80/436.32 = 98.48/x
  3. Step 3: Cross multiply
    290.80x = 436.32 × 98.48
  4. Step 4: Simplify right side
    290.80x = 42,968.79
  5. Step 5: Solve for x
    x = 42,968.79/290.80
  6. Step 6: Final answer
    x = 147.76

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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.