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Finding the Fourth Proportional to 628.26, 942.60 and 420.86

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Solution

The fourth proportional to 628.26, 942.60 and 420.86 is: 631.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.26 : 942.60 = 420.86 : x
  2. Step 2: Convert to fraction form
    628.26/942.60 = 420.86/x
  3. Step 3: Cross multiply
    628.26x = 942.60 × 420.86
  4. Step 4: Simplify right side
    628.26x = 396,702.64
  5. Step 5: Solve for x
    x = 396,702.64/628.26
  6. Step 6: Final answer
    x = 631.43

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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.