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Finding the Fourth Proportional to 756.80, 1,043.88 and 611

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Solution

The fourth proportional to 756.80, 1,043.88 and 611 is: 842.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.80 : 1,043.88 = 611 : x
  2. Step 2: Convert to fraction form
    756.80/1,043.88 = 611/x
  3. Step 3: Cross multiply
    756.80x = 1,043.88 × 611
  4. Step 4: Simplify right side
    756.80x = 637,810.68
  5. Step 5: Solve for x
    x = 637,810.68/756.80
  6. Step 6: Final answer
    x = 842.77

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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.