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Finding the Fourth Proportional to 18,676.79, 28,017.24 and 7,581.87

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Solution

The fourth proportional to 18,676.79, 28,017.24 and 7,581.87 is: 11,373.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,676.79 : 28,017.24 = 7,581.87 : x
  2. Step 2: Convert to fraction form
    18,676.79/28,017.24 = 7,581.87/x
  3. Step 3: Cross multiply
    18,676.79x = 28,017.24 × 7,581.87
  4. Step 4: Simplify right side
    18,676.79x = 212,423,071.44
  5. Step 5: Solve for x
    x = 212,423,071.44/18,676.79
  6. Step 6: Final answer
    x = 11,373.64

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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.