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Finding the Fourth Proportional to 739.74, 1,020.38 and 477.30

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Solution

The fourth proportional to 739.74, 1,020.38 and 477.30 is: 658.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.74 : 1,020.38 = 477.30 : x
  2. Step 2: Convert to fraction form
    739.74/1,020.38 = 477.30/x
  3. Step 3: Cross multiply
    739.74x = 1,020.38 × 477.30
  4. Step 4: Simplify right side
    739.74x = 487,027.37
  5. Step 5: Solve for x
    x = 487,027.37/739.74
  6. Step 6: Final answer
    x = 658.38

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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.