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Finding the Fourth Proportional to 419.94, 628.74 and 214.07

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Solution

The fourth proportional to 419.94, 628.74 and 214.07 is: 320.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.94 : 628.74 = 214.07 : x
  2. Step 2: Convert to fraction form
    419.94/628.74 = 214.07/x
  3. Step 3: Cross multiply
    419.94x = 628.74 × 214.07
  4. Step 4: Simplify right side
    419.94x = 134,594.37
  5. Step 5: Solve for x
    x = 134,594.37/419.94
  6. Step 6: Final answer
    x = 320.51

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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.