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Finding the Fourth Proportional to 5,279.81, 7,919.71 and 1,384.21

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Solution

The fourth proportional to 5,279.81, 7,919.71 and 1,384.21 is: 2,076.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,279.81 : 7,919.71 = 1,384.21 : x
  2. Step 2: Convert to fraction form
    5,279.81/7,919.71 = 1,384.21/x
  3. Step 3: Cross multiply
    5,279.81x = 7,919.71 × 1,384.21
  4. Step 4: Simplify right side
    5,279.81x = 10,962,538.32
  5. Step 5: Solve for x
    x = 10,962,538.32/5,279.81
  6. Step 6: Final answer
    x = 2,076.32

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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.