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Finding the Fourth Proportional to 739.62, 1,020.65 and 436.79

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Solution

The fourth proportional to 739.62, 1,020.65 and 436.79 is: 602.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.62 : 1,020.65 = 436.79 : x
  2. Step 2: Convert to fraction form
    739.62/1,020.65 = 436.79/x
  3. Step 3: Cross multiply
    739.62x = 1,020.65 × 436.79
  4. Step 4: Simplify right side
    739.62x = 445,810.08
  5. Step 5: Solve for x
    x = 445,810.08/739.62
  6. Step 6: Final answer
    x = 602.76

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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.