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Finding the Fourth Proportional to 10,422, 15,639.48 and 4,266

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Solution

The fourth proportional to 10,422, 15,639.48 and 4,266 is: 6,401.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,422 : 15,639.48 = 4,266 : x
  2. Step 2: Convert to fraction form
    10,422/15,639.48 = 4,266/x
  3. Step 3: Cross multiply
    10,422x = 15,639.48 × 4,266
  4. Step 4: Simplify right side
    10,422x = 66,718,021.68
  5. Step 5: Solve for x
    x = 66,718,021.68/10,422
  6. Step 6: Final answer
    x = 6,401.65

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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.