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Finding the Fourth Proportional to 751.05, 1,126.31 and 385.79

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Solution

The fourth proportional to 751.05, 1,126.31 and 385.79 is: 578.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.05 : 1,126.31 = 385.79 : x
  2. Step 2: Convert to fraction form
    751.05/1,126.31 = 385.79/x
  3. Step 3: Cross multiply
    751.05x = 1,126.31 × 385.79
  4. Step 4: Simplify right side
    751.05x = 434,511.57
  5. Step 5: Solve for x
    x = 434,511.57/751.05
  6. Step 6: Final answer
    x = 578.54

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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.