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Finding the Fourth Proportional to 435.70, 652.20 and 422.20

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Solution

The fourth proportional to 435.70, 652.20 and 422.20 is: 631.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.70 : 652.20 = 422.20 : x
  2. Step 2: Convert to fraction form
    435.70/652.20 = 422.20/x
  3. Step 3: Cross multiply
    435.70x = 652.20 × 422.20
  4. Step 4: Simplify right side
    435.70x = 275,358.84
  5. Step 5: Solve for x
    x = 275,358.84/435.70
  6. Step 6: Final answer
    x = 631.99

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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.