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Finding the Fourth Proportional to 976.21, 1,346.30 and 644.98

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Solution

The fourth proportional to 976.21, 1,346.30 and 644.98 is: 889.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.21 : 1,346.30 = 644.98 : x
  2. Step 2: Convert to fraction form
    976.21/1,346.30 = 644.98/x
  3. Step 3: Cross multiply
    976.21x = 1,346.30 × 644.98
  4. Step 4: Simplify right side
    976.21x = 868,326.62
  5. Step 5: Solve for x
    x = 868,326.62/976.21
  6. Step 6: Final answer
    x = 889.49

Related Problems

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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.