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Finding the Fourth Proportional to 12,488.80, 18,731.04 and 4,697.68

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Solution

The fourth proportional to 12,488.80, 18,731.04 and 4,697.68 is: 7,045.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,488.80 : 18,731.04 = 4,697.68 : x
  2. Step 2: Convert to fraction form
    12,488.80/18,731.04 = 4,697.68/x
  3. Step 3: Cross multiply
    12,488.80x = 18,731.04 × 4,697.68
  4. Step 4: Simplify right side
    12,488.80x = 87,992,431.99
  5. Step 5: Solve for x
    x = 87,992,431.99/12,488.80
  6. Step 6: Final answer
    x = 7,045.71

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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.