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Finding the Fourth Proportional to 422.99, 631.11 and 419.75

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Solution

The fourth proportional to 422.99, 631.11 and 419.75 is: 626.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.99 : 631.11 = 419.75 : x
  2. Step 2: Convert to fraction form
    422.99/631.11 = 419.75/x
  3. Step 3: Cross multiply
    422.99x = 631.11 × 419.75
  4. Step 4: Simplify right side
    422.99x = 264,905.27
  5. Step 5: Solve for x
    x = 264,905.27/422.99
  6. Step 6: Final answer
    x = 626.28

Related Problems

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.