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Finding the Fourth Proportional to 12,421, 18,631.50 and 3,187

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Solution

The fourth proportional to 12,421, 18,631.50 and 3,187 is: 4,780.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,421 : 18,631.50 = 3,187 : x
  2. Step 2: Convert to fraction form
    12,421/18,631.50 = 3,187/x
  3. Step 3: Cross multiply
    12,421x = 18,631.50 × 3,187
  4. Step 4: Simplify right side
    12,421x = 59,378,590.50
  5. Step 5: Solve for x
    x = 59,378,590.50/12,421
  6. Step 6: Final answer
    x = 4,780.50

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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.