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Finding the Fourth Proportional to 12,638.65, 17,443.99 and 8,664.99

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Solution

The fourth proportional to 12,638.65, 17,443.99 and 8,664.99 is: 11,959.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,638.65 : 17,443.99 = 8,664.99 : x
  2. Step 2: Convert to fraction form
    12,638.65/17,443.99 = 8,664.99/x
  3. Step 3: Cross multiply
    12,638.65x = 17,443.99 × 8,664.99
  4. Step 4: Simplify right side
    12,638.65x = 151,151,911.69
  5. Step 5: Solve for x
    x = 151,151,911.69/12,638.65
  6. Step 6: Final answer
    x = 11,959.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.