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Finding the Fourth Proportional to 744.22, 1,116.45 and 257.20

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Solution

The fourth proportional to 744.22, 1,116.45 and 257.20 is: 385.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.22 : 1,116.45 = 257.20 : x
  2. Step 2: Convert to fraction form
    744.22/1,116.45 = 257.20/x
  3. Step 3: Cross multiply
    744.22x = 1,116.45 × 257.20
  4. Step 4: Simplify right side
    744.22x = 287,150.94
  5. Step 5: Solve for x
    x = 287,150.94/744.22
  6. Step 6: Final answer
    x = 385.84

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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.