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Finding the Fourth Proportional to 12,459, 18,688.86 and 3,225

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Solution

The fourth proportional to 12,459, 18,688.86 and 3,225 is: 4,837.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,459 : 18,688.86 = 3,225 : x
  2. Step 2: Convert to fraction form
    12,459/18,688.86 = 3,225/x
  3. Step 3: Cross multiply
    12,459x = 18,688.86 × 3,225
  4. Step 4: Simplify right side
    12,459x = 60,271,573.50
  5. Step 5: Solve for x
    x = 60,271,573.50/12,459
  6. Step 6: Final answer
    x = 4,837.59

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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.