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Finding the Fourth Proportional to 435.21, 650.87 and 386.76

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Solution

The fourth proportional to 435.21, 650.87 and 386.76 is: 578.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.21 : 650.87 = 386.76 : x
  2. Step 2: Convert to fraction form
    435.21/650.87 = 386.76/x
  3. Step 3: Cross multiply
    435.21x = 650.87 × 386.76
  4. Step 4: Simplify right side
    435.21x = 251,732.44
  5. Step 5: Solve for x
    x = 251,732.44/435.21
  6. Step 6: Final answer
    x = 578.42

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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.