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Finding the Fourth Proportional to 749.44, 1,118.56 and 639.04

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Solution

The fourth proportional to 749.44, 1,118.56 and 639.04 is: 953.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.44 : 1,118.56 = 639.04 : x
  2. Step 2: Convert to fraction form
    749.44/1,118.56 = 639.04/x
  3. Step 3: Cross multiply
    749.44x = 1,118.56 × 639.04
  4. Step 4: Simplify right side
    749.44x = 714,804.58
  5. Step 5: Solve for x
    x = 714,804.58/749.44
  6. Step 6: Final answer
    x = 953.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.