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Finding the Fourth Proportional to 420.00, 629.78 and 188.69

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Solution

The fourth proportional to 420.00, 629.78 and 188.69 is: 282.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.00 : 629.78 = 188.69 : x
  2. Step 2: Convert to fraction form
    420.00/629.78 = 188.69/x
  3. Step 3: Cross multiply
    420.00x = 629.78 × 188.69
  4. Step 4: Simplify right side
    420.00x = 118,833.19
  5. Step 5: Solve for x
    x = 118,833.19/420.00
  6. Step 6: Final answer
    x = 282.94

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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.