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Finding the Fourth Proportional to 739.86, 1,021.14 and 487.80

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Solution

The fourth proportional to 739.86, 1,021.14 and 487.80 is: 673.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.86 : 1,021.14 = 487.80 : x
  2. Step 2: Convert to fraction form
    739.86/1,021.14 = 487.80/x
  3. Step 3: Cross multiply
    739.86x = 1,021.14 × 487.80
  4. Step 4: Simplify right side
    739.86x = 498,112.09
  5. Step 5: Solve for x
    x = 498,112.09/739.86
  6. Step 6: Final answer
    x = 673.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.