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Finding the Fourth Proportional to 1,072.05, 1,479.43 and 629.96

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Solution

The fourth proportional to 1,072.05, 1,479.43 and 629.96 is: 869.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.05 : 1,479.43 = 629.96 : x
  2. Step 2: Convert to fraction form
    1,072.05/1,479.43 = 629.96/x
  3. Step 3: Cross multiply
    1,072.05x = 1,479.43 × 629.96
  4. Step 4: Simplify right side
    1,072.05x = 931,975.11
  5. Step 5: Solve for x
    x = 931,975.11/1,072.05
  6. Step 6: Final answer
    x = 869.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.