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Finding the Fourth Proportional to 12,730.72, 18,964.80 and 12,343.80

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Solution

The fourth proportional to 12,730.72, 18,964.80 and 12,343.80 is: 18,388.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,730.72 : 18,964.80 = 12,343.80 : x
  2. Step 2: Convert to fraction form
    12,730.72/18,964.80 = 12,343.80/x
  3. Step 3: Cross multiply
    12,730.72x = 18,964.80 × 12,343.80
  4. Step 4: Simplify right side
    12,730.72x = 234,097,698.24
  5. Step 5: Solve for x
    x = 234,097,698.24/12,730.72
  6. Step 6: Final answer
    x = 18,388.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.