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Finding the Fourth Proportional to 976.98, 1,348.47 and 645.96

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Solution

The fourth proportional to 976.98, 1,348.47 and 645.96 is: 891.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.98 : 1,348.47 = 645.96 : x
  2. Step 2: Convert to fraction form
    976.98/1,348.47 = 645.96/x
  3. Step 3: Cross multiply
    976.98x = 1,348.47 × 645.96
  4. Step 4: Simplify right side
    976.98x = 871,057.68
  5. Step 5: Solve for x
    x = 871,057.68/976.98
  6. Step 6: Final answer
    x = 891.58

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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.