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Finding the Fourth Proportional to 18,637.99, 27,920.09 and 12,068.80

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Solution

The fourth proportional to 18,637.99, 27,920.09 and 12,068.80 is: 18,079.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,637.99 : 27,920.09 = 12,068.80 : x
  2. Step 2: Convert to fraction form
    18,637.99/27,920.09 = 12,068.80/x
  3. Step 3: Cross multiply
    18,637.99x = 27,920.09 × 12,068.80
  4. Step 4: Simplify right side
    18,637.99x = 336,961,921.85
  5. Step 5: Solve for x
    x = 336,961,921.85/18,637.99
  6. Step 6: Final answer
    x = 18,079.31

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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.