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Finding the Fourth Proportional to 12,620.62, 18,916.58 and 7,679.38

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Solution

The fourth proportional to 12,620.62, 18,916.58 and 7,679.38 is: 11,510.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,620.62 : 18,916.58 = 7,679.38 : x
  2. Step 2: Convert to fraction form
    12,620.62/18,916.58 = 7,679.38/x
  3. Step 3: Cross multiply
    12,620.62x = 18,916.58 × 7,679.38
  4. Step 4: Simplify right side
    12,620.62x = 145,267,606.12
  5. Step 5: Solve for x
    x = 145,267,606.12/12,620.62
  6. Step 6: Final answer
    x = 11,510.34

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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.