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Finding the Fourth Proportional to 626.48, 939.16 and 420.24

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Solution

The fourth proportional to 626.48, 939.16 and 420.24 is: 629.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.48 : 939.16 = 420.24 : x
  2. Step 2: Convert to fraction form
    626.48/939.16 = 420.24/x
  3. Step 3: Cross multiply
    626.48x = 939.16 × 420.24
  4. Step 4: Simplify right side
    626.48x = 394,672.60
  5. Step 5: Solve for x
    x = 394,672.60/626.48
  6. Step 6: Final answer
    x = 629.98

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1.5x scale

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.