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Finding the Fourth Proportional to 976.78, 1,348.03 and 628.22

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Solution

The fourth proportional to 976.78, 1,348.03 and 628.22 is: 866.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.78 : 1,348.03 = 628.22 : x
  2. Step 2: Convert to fraction form
    976.78/1,348.03 = 628.22/x
  3. Step 3: Cross multiply
    976.78x = 1,348.03 × 628.22
  4. Step 4: Simplify right side
    976.78x = 846,859.41
  5. Step 5: Solve for x
    x = 846,859.41/976.78
  6. Step 6: Final answer
    x = 866.99

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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.