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Finding the Fourth Proportional to 290.20, 434.76 and 247

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Solution

The fourth proportional to 290.20, 434.76 and 247 is: 370.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.20 : 434.76 = 247 : x
  2. Step 2: Convert to fraction form
    290.20/434.76 = 247/x
  3. Step 3: Cross multiply
    290.20x = 434.76 × 247
  4. Step 4: Simplify right side
    290.20x = 107,385.72
  5. Step 5: Solve for x
    x = 107,385.72/290.20
  6. Step 6: Final answer
    x = 370.04

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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.