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Finding the Fourth Proportional to 18,812.64, 28,208.16 and 12,579.80

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Solution

The fourth proportional to 18,812.64, 28,208.16 and 12,579.80 is: 18,862.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,812.64 : 28,208.16 = 12,579.80 : x
  2. Step 2: Convert to fraction form
    18,812.64/28,208.16 = 12,579.80/x
  3. Step 3: Cross multiply
    18,812.64x = 28,208.16 × 12,579.80
  4. Step 4: Simplify right side
    18,812.64x = 354,853,011.17
  5. Step 5: Solve for x
    x = 354,853,011.17/18,812.64
  6. Step 6: Final answer
    x = 18,862.48

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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.