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Finding the Fourth Proportional to 419.76, 629.64 and 312.12

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Solution

The fourth proportional to 419.76, 629.64 and 312.12 is: 468.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.76 : 629.64 = 312.12 : x
  2. Step 2: Convert to fraction form
    419.76/629.64 = 312.12/x
  3. Step 3: Cross multiply
    419.76x = 629.64 × 312.12
  4. Step 4: Simplify right side
    419.76x = 196,523.24
  5. Step 5: Solve for x
    x = 196,523.24/419.76
  6. Step 6: Final answer
    x = 468.18

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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.