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Finding the Fourth Proportional to 8,628.80, 12,928.80 and 8,110.40

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Solution

The fourth proportional to 8,628.80, 12,928.80 and 8,110.40 is: 12,152.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,628.80 : 12,928.80 = 8,110.40 : x
  2. Step 2: Convert to fraction form
    8,628.80/12,928.80 = 8,110.40/x
  3. Step 3: Cross multiply
    8,628.80x = 12,928.80 × 8,110.40
  4. Step 4: Simplify right side
    8,628.80x = 104,857,739.52
  5. Step 5: Solve for x
    x = 104,857,739.52/8,628.80
  6. Step 6: Final answer
    x = 12,152.07

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1.5x scale

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.