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Finding the Fourth Proportional to 739.74, 1,112.04 and 618.24

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Solution

The fourth proportional to 739.74, 1,112.04 and 618.24 is: 929.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.74 : 1,112.04 = 618.24 : x
  2. Step 2: Convert to fraction form
    739.74/1,112.04 = 618.24/x
  3. Step 3: Cross multiply
    739.74x = 1,112.04 × 618.24
  4. Step 4: Simplify right side
    739.74x = 687,507.61
  5. Step 5: Solve for x
    x = 687,507.61/739.74
  6. Step 6: Final answer
    x = 929.39

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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.