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Finding the Fourth Proportional to 976.44, 1,347.28 and 556.68

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Solution

The fourth proportional to 976.44, 1,347.28 and 556.68 is: 768.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.44 : 1,347.28 = 556.68 : x
  2. Step 2: Convert to fraction form
    976.44/1,347.28 = 556.68/x
  3. Step 3: Cross multiply
    976.44x = 1,347.28 × 556.68
  4. Step 4: Simplify right side
    976.44x = 749,997.39
  5. Step 5: Solve for x
    x = 749,997.39/976.44
  6. Step 6: Final answer
    x = 768.09

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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.