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Finding the Fourth Proportional to 739.45, 1,020.51 and 515.71

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Solution

The fourth proportional to 739.45, 1,020.51 and 515.71 is: 711.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.45 : 1,020.51 = 515.71 : x
  2. Step 2: Convert to fraction form
    739.45/1,020.51 = 515.71/x
  3. Step 3: Cross multiply
    739.45x = 1,020.51 × 515.71
  4. Step 4: Simplify right side
    739.45x = 526,286.09
  5. Step 5: Solve for x
    x = 526,286.09/739.45
  6. Step 6: Final answer
    x = 711.73

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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.