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Finding the Fourth Proportional to 695, 1,040.42 and 420.26

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Solution

The fourth proportional to 695, 1,040.42 and 420.26 is: 629.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    695 : 1,040.42 = 420.26 : x
  2. Step 2: Convert to fraction form
    695/1,040.42 = 420.26/x
  3. Step 3: Cross multiply
    695x = 1,040.42 × 420.26
  4. Step 4: Simplify right side
    695x = 437,246.91
  5. Step 5: Solve for x
    x = 437,246.91/695
  6. Step 6: Final answer
    x = 629.13

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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.