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Finding the Fourth Proportional to 14,619.20, 21,918 and 12,143.84

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Solution

The fourth proportional to 14,619.20, 21,918 and 12,143.84 is: 18,206.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,619.20 : 21,918 = 12,143.84 : x
  2. Step 2: Convert to fraction form
    14,619.20/21,918 = 12,143.84/x
  3. Step 3: Cross multiply
    14,619.20x = 21,918 × 12,143.84
  4. Step 4: Simplify right side
    14,619.20x = 266,168,685.12
  5. Step 5: Solve for x
    x = 266,168,685.12/14,619.20
  6. Step 6: Final answer
    x = 18,206.79

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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.