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Finding the Fourth Proportional to 3,939.36, 5,908.90 and 977.82

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Solution

The fourth proportional to 3,939.36, 5,908.90 and 977.82 is: 1,466.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939.36 : 5,908.90 = 977.82 : x
  2. Step 2: Convert to fraction form
    3,939.36/5,908.90 = 977.82/x
  3. Step 3: Cross multiply
    3,939.36x = 5,908.90 × 977.82
  4. Step 4: Simplify right side
    3,939.36x = 5,777,840.60
  5. Step 5: Solve for x
    x = 5,777,840.60/3,939.36
  6. Step 6: Final answer
    x = 1,466.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.