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Finding the Fourth Proportional to 420.08, 629.60 and 203.19

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Solution

The fourth proportional to 420.08, 629.60 and 203.19 is: 304.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.08 : 629.60 = 203.19 : x
  2. Step 2: Convert to fraction form
    420.08/629.60 = 203.19/x
  3. Step 3: Cross multiply
    420.08x = 629.60 × 203.19
  4. Step 4: Simplify right side
    420.08x = 127,927.41
  5. Step 5: Solve for x
    x = 127,927.41/420.08
  6. Step 6: Final answer
    x = 304.53

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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.