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Finding the Fourth Proportional to 756.77, 1,128.85 and 669.29

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Solution

The fourth proportional to 756.77, 1,128.85 and 669.29 is: 998.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.77 : 1,128.85 = 669.29 : x
  2. Step 2: Convert to fraction form
    756.77/1,128.85 = 669.29/x
  3. Step 3: Cross multiply
    756.77x = 1,128.85 × 669.29
  4. Step 4: Simplify right side
    756.77x = 755,520.70
  5. Step 5: Solve for x
    x = 755,520.70/756.77
  6. Step 6: Final answer
    x = 998.36

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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.