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Finding the Fourth Proportional to 739.26, 1,020.90 and 613.68

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Solution

The fourth proportional to 739.26, 1,020.90 and 613.68 is: 847.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.26 : 1,020.90 = 613.68 : x
  2. Step 2: Convert to fraction form
    739.26/1,020.90 = 613.68/x
  3. Step 3: Cross multiply
    739.26x = 1,020.90 × 613.68
  4. Step 4: Simplify right side
    739.26x = 626,505.91
  5. Step 5: Solve for x
    x = 626,505.91/739.26
  6. Step 6: Final answer
    x = 847.48

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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.