Home / 3,916-5,874.81-1,318.87

Finding the Fourth Proportional to 3,916, 5,874.81 and 1,318.87

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Solution

The fourth proportional to 3,916, 5,874.81 and 1,318.87 is: 1,978.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,916 : 5,874.81 = 1,318.87 : x
  2. Step 2: Convert to fraction form
    3,916/5,874.81 = 1,318.87/x
  3. Step 3: Cross multiply
    3,916x = 5,874.81 × 1,318.87
  4. Step 4: Simplify right side
    3,916x = 7,748,110.66
  5. Step 5: Solve for x
    x = 7,748,110.66/3,916
  6. Step 6: Final answer
    x = 1,978.58

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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.