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Finding the Fourth Proportional to 1,287.55, 1,776.49 and 756.33

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Solution

The fourth proportional to 1,287.55, 1,776.49 and 756.33 is: 1,043.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.55 : 1,776.49 = 756.33 : x
  2. Step 2: Convert to fraction form
    1,287.55/1,776.49 = 756.33/x
  3. Step 3: Cross multiply
    1,287.55x = 1,776.49 × 756.33
  4. Step 4: Simplify right side
    1,287.55x = 1,343,612.68
  5. Step 5: Solve for x
    x = 1,343,612.68/1,287.55
  6. Step 6: Final answer
    x = 1,043.54

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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.