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Finding the Fourth Proportional to 739.64, 1,108.74 and 618.14

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Solution

The fourth proportional to 739.64, 1,108.74 and 618.14 is: 926.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.64 : 1,108.74 = 618.14 : x
  2. Step 2: Convert to fraction form
    739.64/1,108.74 = 618.14/x
  3. Step 3: Cross multiply
    739.64x = 1,108.74 × 618.14
  4. Step 4: Simplify right side
    739.64x = 685,356.54
  5. Step 5: Solve for x
    x = 685,356.54/739.64
  6. Step 6: Final answer
    x = 926.61

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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.