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Finding the Fourth Proportional to 290.20, 434.64 and 287.74

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Solution

The fourth proportional to 290.20, 434.64 and 287.74 is: 430.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.20 : 434.64 = 287.74 : x
  2. Step 2: Convert to fraction form
    290.20/434.64 = 287.74/x
  3. Step 3: Cross multiply
    290.20x = 434.64 × 287.74
  4. Step 4: Simplify right side
    290.20x = 125,063.31
  5. Step 5: Solve for x
    x = 125,063.31/290.20
  6. Step 6: Final answer
    x = 430.96

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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.