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Finding the Fourth Proportional to 8,728.40, 13,078.20 and 7,259.60

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Solution

The fourth proportional to 8,728.40, 13,078.20 and 7,259.60 is: 10,877.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,728.40 : 13,078.20 = 7,259.60 : x
  2. Step 2: Convert to fraction form
    8,728.40/13,078.20 = 7,259.60/x
  3. Step 3: Cross multiply
    8,728.40x = 13,078.20 × 7,259.60
  4. Step 4: Simplify right side
    8,728.40x = 94,942,500.72
  5. Step 5: Solve for x
    x = 94,942,500.72/8,728.40
  6. Step 6: Final answer
    x = 10,877.42

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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.