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Finding the Fourth Proportional to 420.04, 629.60 and 316.99

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Solution

The fourth proportional to 420.04, 629.60 and 316.99 is: 475.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.04 : 629.60 = 316.99 : x
  2. Step 2: Convert to fraction form
    420.04/629.60 = 316.99/x
  3. Step 3: Cross multiply
    420.04x = 629.60 × 316.99
  4. Step 4: Simplify right side
    420.04x = 199,578.18
  5. Step 5: Solve for x
    x = 199,578.18/420.04
  6. Step 6: Final answer
    x = 475.14

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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.