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Finding the Fourth Proportional to 8,321.72, 12,485.28 and 3,128

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Solution

The fourth proportional to 8,321.72, 12,485.28 and 3,128 is: 4,693.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,321.72 : 12,485.28 = 3,128 : x
  2. Step 2: Convert to fraction form
    8,321.72/12,485.28 = 3,128/x
  3. Step 3: Cross multiply
    8,321.72x = 12,485.28 × 3,128
  4. Step 4: Simplify right side
    8,321.72x = 39,053,955.84
  5. Step 5: Solve for x
    x = 39,053,955.84/8,321.72
  6. Step 6: Final answer
    x = 4,693.01

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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.