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Finding the Fourth Proportional to 12,628.40, 18,942.60 and 9,129.20

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Solution

The fourth proportional to 12,628.40, 18,942.60 and 9,129.20 is: 13,693.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,628.40 : 18,942.60 = 9,129.20 : x
  2. Step 2: Convert to fraction form
    12,628.40/18,942.60 = 9,129.20/x
  3. Step 3: Cross multiply
    12,628.40x = 18,942.60 × 9,129.20
  4. Step 4: Simplify right side
    12,628.40x = 172,930,783.92
  5. Step 5: Solve for x
    x = 172,930,783.92/12,628.40
  6. Step 6: Final answer
    x = 13,693.80

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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.