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Finding the Fourth Proportional to 13,106.80, 19,627.80 and 8,700.40

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Solution

The fourth proportional to 13,106.80, 19,627.80 and 8,700.40 is: 13,029.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,106.80 : 19,627.80 = 8,700.40 : x
  2. Step 2: Convert to fraction form
    13,106.80/19,627.80 = 8,700.40/x
  3. Step 3: Cross multiply
    13,106.80x = 19,627.80 × 8,700.40
  4. Step 4: Simplify right side
    13,106.80x = 170,769,711.12
  5. Step 5: Solve for x
    x = 170,769,711.12/13,106.80
  6. Step 6: Final answer
    x = 13,029.09

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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.