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Finding the Fourth Proportional to 8,652.40, 12,978.80 and 3,106.12

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Solution

The fourth proportional to 8,652.40, 12,978.80 and 3,106.12 is: 4,659.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,652.40 : 12,978.80 = 3,106.12 : x
  2. Step 2: Convert to fraction form
    8,652.40/12,978.80 = 3,106.12/x
  3. Step 3: Cross multiply
    8,652.40x = 12,978.80 × 3,106.12
  4. Step 4: Simplify right side
    8,652.40x = 40,313,710.26
  5. Step 5: Solve for x
    x = 40,313,710.26/8,652.40
  6. Step 6: Final answer
    x = 4,659.25

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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.