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Finding the Fourth Proportional to 1,038.69, 1,558.44 and 628.12

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Solution

The fourth proportional to 1,038.69, 1,558.44 and 628.12 is: 942.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.69 : 1,558.44 = 628.12 : x
  2. Step 2: Convert to fraction form
    1,038.69/1,558.44 = 628.12/x
  3. Step 3: Cross multiply
    1,038.69x = 1,558.44 × 628.12
  4. Step 4: Simplify right side
    1,038.69x = 978,889.28
  5. Step 5: Solve for x
    x = 978,889.28/1,038.69
  6. Step 6: Final answer
    x = 942.43

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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.