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Finding the Fourth Proportional to 18,439.72, 27,647.76 and 7,916.64

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Solution

The fourth proportional to 18,439.72, 27,647.76 and 7,916.64 is: 11,869.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,439.72 : 27,647.76 = 7,916.64 : x
  2. Step 2: Convert to fraction form
    18,439.72/27,647.76 = 7,916.64/x
  3. Step 3: Cross multiply
    18,439.72x = 27,647.76 × 7,916.64
  4. Step 4: Simplify right side
    18,439.72x = 218,877,362.73
  5. Step 5: Solve for x
    x = 218,877,362.73/18,439.72
  6. Step 6: Final answer
    x = 11,869.89

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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.