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Finding the Fourth Proportional to 18,720.79, 28,081.10 and 4,869.75

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Solution

The fourth proportional to 18,720.79, 28,081.10 and 4,869.75 is: 7,304.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.79 : 28,081.10 = 4,869.75 : x
  2. Step 2: Convert to fraction form
    18,720.79/28,081.10 = 4,869.75/x
  3. Step 3: Cross multiply
    18,720.79x = 28,081.10 × 4,869.75
  4. Step 4: Simplify right side
    18,720.79x = 136,747,936.73
  5. Step 5: Solve for x
    x = 136,747,936.73/18,720.79
  6. Step 6: Final answer
    x = 7,304.60

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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.