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Finding the Fourth Proportional to 762.63, 1,049.59 and 628.78

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Solution

The fourth proportional to 762.63, 1,049.59 and 628.78 is: 865.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.63 : 1,049.59 = 628.78 : x
  2. Step 2: Convert to fraction form
    762.63/1,049.59 = 628.78/x
  3. Step 3: Cross multiply
    762.63x = 1,049.59 × 628.78
  4. Step 4: Simplify right side
    762.63x = 659,952.81
  5. Step 5: Solve for x
    x = 659,952.81/762.63
  6. Step 6: Final answer
    x = 865.37

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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.