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Finding the Fourth Proportional to 762.27, 1,050.75 and 638.34

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Solution

The fourth proportional to 762.27, 1,050.75 and 638.34 is: 879.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.27 : 1,050.75 = 638.34 : x
  2. Step 2: Convert to fraction form
    762.27/1,050.75 = 638.34/x
  3. Step 3: Cross multiply
    762.27x = 1,050.75 × 638.34
  4. Step 4: Simplify right side
    762.27x = 670,735.76
  5. Step 5: Solve for x
    x = 670,735.76/762.27
  6. Step 6: Final answer
    x = 879.92

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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.