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Finding the Fourth Proportional to 756.36, 1,128.69 and 674.55

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Solution

The fourth proportional to 756.36, 1,128.69 and 674.55 is: 1,006.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.36 : 1,128.69 = 674.55 : x
  2. Step 2: Convert to fraction form
    756.36/1,128.69 = 674.55/x
  3. Step 3: Cross multiply
    756.36x = 1,128.69 × 674.55
  4. Step 4: Simplify right side
    756.36x = 761,357.84
  5. Step 5: Solve for x
    x = 761,357.84/756.36
  6. Step 6: Final answer
    x = 1,006.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.