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Finding the Fourth Proportional to 739.67, 1,020.72 and 403.56

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Solution

The fourth proportional to 739.67, 1,020.72 and 403.56 is: 556.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.67 : 1,020.72 = 403.56 : x
  2. Step 2: Convert to fraction form
    739.67/1,020.72 = 403.56/x
  3. Step 3: Cross multiply
    739.67x = 1,020.72 × 403.56
  4. Step 4: Simplify right side
    739.67x = 411,921.76
  5. Step 5: Solve for x
    x = 411,921.76/739.67
  6. Step 6: Final answer
    x = 556.90

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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.