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Finding the Fourth Proportional to 739.65, 1,020.80 and 491.03

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Solution

The fourth proportional to 739.65, 1,020.80 and 491.03 is: 677.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.65 : 1,020.80 = 491.03 : x
  2. Step 2: Convert to fraction form
    739.65/1,020.80 = 491.03/x
  3. Step 3: Cross multiply
    739.65x = 1,020.80 × 491.03
  4. Step 4: Simplify right side
    739.65x = 501,243.38
  5. Step 5: Solve for x
    x = 501,243.38/739.65
  6. Step 6: Final answer
    x = 677.68

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Double scale
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1.5x scale

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.