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Finding the Fourth Proportional to 18,638.55, 27,929.11 and 8,637.13

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Solution

The fourth proportional to 18,638.55, 27,929.11 and 8,637.13 is: 12,942.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,638.55 : 27,929.11 = 8,637.13 : x
  2. Step 2: Convert to fraction form
    18,638.55/27,929.11 = 8,637.13/x
  3. Step 3: Cross multiply
    18,638.55x = 27,929.11 × 8,637.13
  4. Step 4: Simplify right side
    18,638.55x = 241,227,214.21
  5. Step 5: Solve for x
    x = 241,227,214.21/18,638.55
  6. Step 6: Final answer
    x = 12,942.38

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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.