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Finding the Fourth Proportional to 8,240, 11,371.20 and 4,928

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Solution

The fourth proportional to 8,240, 11,371.20 and 4,928 is: 6,800.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,240 : 11,371.20 = 4,928 : x
  2. Step 2: Convert to fraction form
    8,240/11,371.20 = 4,928/x
  3. Step 3: Cross multiply
    8,240x = 11,371.20 × 4,928
  4. Step 4: Simplify right side
    8,240x = 56,037,273.60
  5. Step 5: Solve for x
    x = 56,037,273.60/8,240
  6. Step 6: Final answer
    x = 6,800.64

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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.