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Finding the Fourth Proportional to 419.79, 629.84 and 188.67

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Solution

The fourth proportional to 419.79, 629.84 and 188.67 is: 283.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.79 : 629.84 = 188.67 : x
  2. Step 2: Convert to fraction form
    419.79/629.84 = 188.67/x
  3. Step 3: Cross multiply
    419.79x = 629.84 × 188.67
  4. Step 4: Simplify right side
    419.79x = 118,830.97
  5. Step 5: Solve for x
    x = 118,830.97/419.79
  6. Step 6: Final answer
    x = 283.07

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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.