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Finding the Fourth Proportional to 744.68, 1,116.36 and 257.39

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Solution

The fourth proportional to 744.68, 1,116.36 and 257.39 is: 385.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.68 : 1,116.36 = 257.39 : x
  2. Step 2: Convert to fraction form
    744.68/1,116.36 = 257.39/x
  3. Step 3: Cross multiply
    744.68x = 1,116.36 × 257.39
  4. Step 4: Simplify right side
    744.68x = 287,339.90
  5. Step 5: Solve for x
    x = 287,339.90/744.68
  6. Step 6: Final answer
    x = 385.86

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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.