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Finding the Fourth Proportional to 744.69, 1,115.81 and 257.47

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Solution

The fourth proportional to 744.69, 1,115.81 and 257.47 is: 385.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.69 : 1,115.81 = 257.47 : x
  2. Step 2: Convert to fraction form
    744.69/1,115.81 = 257.47/x
  3. Step 3: Cross multiply
    744.69x = 1,115.81 × 257.47
  4. Step 4: Simplify right side
    744.69x = 287,287.60
  5. Step 5: Solve for x
    x = 287,287.60/744.69
  6. Step 6: Final answer
    x = 385.78

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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.