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Finding the Fourth Proportional to 8,758.40, 13,140.80 and 4,137.92

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Solution

The fourth proportional to 8,758.40, 13,140.80 and 4,137.92 is: 6,208.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,758.40 : 13,140.80 = 4,137.92 : x
  2. Step 2: Convert to fraction form
    8,758.40/13,140.80 = 4,137.92/x
  3. Step 3: Cross multiply
    8,758.40x = 13,140.80 × 4,137.92
  4. Step 4: Simplify right side
    8,758.40x = 54,375,579.14
  5. Step 5: Solve for x
    x = 54,375,579.14/8,758.40
  6. Step 6: Final answer
    x = 6,208.39

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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.