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Finding the Fourth Proportional to 739.40, 1,020.58 and 518.41

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Solution

The fourth proportional to 739.40, 1,020.58 and 518.41 is: 715.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.40 : 1,020.58 = 518.41 : x
  2. Step 2: Convert to fraction form
    739.40/1,020.58 = 518.41/x
  3. Step 3: Cross multiply
    739.40x = 1,020.58 × 518.41
  4. Step 4: Simplify right side
    739.40x = 529,078.88
  5. Step 5: Solve for x
    x = 529,078.88/739.40
  6. Step 6: Final answer
    x = 715.55

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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.