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Finding the Fourth Proportional to 976.64, 1,347.36 and 645.44

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Solution

The fourth proportional to 976.64, 1,347.36 and 645.44 is: 890.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.64 : 1,347.36 = 645.44 : x
  2. Step 2: Convert to fraction form
    976.64/1,347.36 = 645.44/x
  3. Step 3: Cross multiply
    976.64x = 1,347.36 × 645.44
  4. Step 4: Simplify right side
    976.64x = 869,640.04
  5. Step 5: Solve for x
    x = 869,640.04/976.64
  6. Step 6: Final answer
    x = 890.44

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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.