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Finding the Fourth Proportional to 435.12, 653.40 and 426.48

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Solution

The fourth proportional to 435.12, 653.40 and 426.48 is: 640.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.12 : 653.40 = 426.48 : x
  2. Step 2: Convert to fraction form
    435.12/653.40 = 426.48/x
  3. Step 3: Cross multiply
    435.12x = 653.40 × 426.48
  4. Step 4: Simplify right side
    435.12x = 278,662.03
  5. Step 5: Solve for x
    x = 278,662.03/435.12
  6. Step 6: Final answer
    x = 640.43

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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.