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Finding the Fourth Proportional to 290.21, 435.06 and 143.87

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Solution

The fourth proportional to 290.21, 435.06 and 143.87 is: 215.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.21 : 435.06 = 143.87 : x
  2. Step 2: Convert to fraction form
    290.21/435.06 = 143.87/x
  3. Step 3: Cross multiply
    290.21x = 435.06 × 143.87
  4. Step 4: Simplify right side
    290.21x = 62,589.91
  5. Step 5: Solve for x
    x = 62,589.91/290.21
  6. Step 6: Final answer
    x = 215.67

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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.