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Finding the Fourth Proportional to 976.36, 1,347.44 and 644.21

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Solution

The fourth proportional to 976.36, 1,347.44 and 644.21 is: 889.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.36 : 1,347.44 = 644.21 : x
  2. Step 2: Convert to fraction form
    976.36/1,347.44 = 644.21/x
  3. Step 3: Cross multiply
    976.36x = 1,347.44 × 644.21
  4. Step 4: Simplify right side
    976.36x = 868,034.85
  5. Step 5: Solve for x
    x = 868,034.85/976.36
  6. Step 6: Final answer
    x = 889.05

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Double scale
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1.5x scale

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.