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Finding the Fourth Proportional to 12,628.60, 18,942.90 and 9,129.40

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Solution

The fourth proportional to 12,628.60, 18,942.90 and 9,129.40 is: 13,694.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,628.60 : 18,942.90 = 9,129.40 : x
  2. Step 2: Convert to fraction form
    12,628.60/18,942.90 = 9,129.40/x
  3. Step 3: Cross multiply
    12,628.60x = 18,942.90 × 9,129.40
  4. Step 4: Simplify right side
    12,628.60x = 172,937,311.26
  5. Step 5: Solve for x
    x = 172,937,311.26/12,628.60
  6. Step 6: Final answer
    x = 13,694.10

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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.