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Finding the Fourth Proportional to 744.58, 1,116.12 and 257.26

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Solution

The fourth proportional to 744.58, 1,116.12 and 257.26 is: 385.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.58 : 1,116.12 = 257.26 : x
  2. Step 2: Convert to fraction form
    744.58/1,116.12 = 257.26/x
  3. Step 3: Cross multiply
    744.58x = 1,116.12 × 257.26
  4. Step 4: Simplify right side
    744.58x = 287,133.03
  5. Step 5: Solve for x
    x = 287,133.03/744.58
  6. Step 6: Final answer
    x = 385.63

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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.