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Finding the Fourth Proportional to 976.30, 1,347.32 and 644.49

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Solution

The fourth proportional to 976.30, 1,347.32 and 644.49 is: 889.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.30 : 1,347.32 = 644.49 : x
  2. Step 2: Convert to fraction form
    976.30/1,347.32 = 644.49/x
  3. Step 3: Cross multiply
    976.30x = 1,347.32 × 644.49
  4. Step 4: Simplify right side
    976.30x = 868,335.88
  5. Step 5: Solve for x
    x = 868,335.88/976.30
  6. Step 6: Final answer
    x = 889.42

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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.