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Finding the Fourth Proportional to 996.15, 1,492.20 and 629.64

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Solution

The fourth proportional to 996.15, 1,492.20 and 629.64 is: 943.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.15 : 1,492.20 = 629.64 : x
  2. Step 2: Convert to fraction form
    996.15/1,492.20 = 629.64/x
  3. Step 3: Cross multiply
    996.15x = 1,492.20 × 629.64
  4. Step 4: Simplify right side
    996.15x = 939,548.81
  5. Step 5: Solve for x
    x = 939,548.81/996.15
  6. Step 6: Final answer
    x = 943.18

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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.