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Finding the Fourth Proportional to 420.14, 629.58 and 203.46

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Solution

The fourth proportional to 420.14, 629.58 and 203.46 is: 304.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.14 : 629.58 = 203.46 : x
  2. Step 2: Convert to fraction form
    420.14/629.58 = 203.46/x
  3. Step 3: Cross multiply
    420.14x = 629.58 × 203.46
  4. Step 4: Simplify right side
    420.14x = 128,094.35
  5. Step 5: Solve for x
    x = 128,094.35/420.14
  6. Step 6: Final answer
    x = 304.89

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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.