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Finding the Fourth Proportional to 12,662.78, 18,969.76 and 7,099.28

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Solution

The fourth proportional to 12,662.78, 18,969.76 and 7,099.28 is: 10,635.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,662.78 : 18,969.76 = 7,099.28 : x
  2. Step 2: Convert to fraction form
    12,662.78/18,969.76 = 7,099.28/x
  3. Step 3: Cross multiply
    12,662.78x = 18,969.76 × 7,099.28
  4. Step 4: Simplify right side
    12,662.78x = 134,671,637.77
  5. Step 5: Solve for x
    x = 134,671,637.77/12,662.78
  6. Step 6: Final answer
    x = 10,635.23

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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.