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Finding the Fourth Proportional to 14,478.45, 21,720.86 and 8,241.40

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Solution

The fourth proportional to 14,478.45, 21,720.86 and 8,241.40 is: 12,363.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,478.45 : 21,720.86 = 8,241.40 : x
  2. Step 2: Convert to fraction form
    14,478.45/21,720.86 = 8,241.40/x
  3. Step 3: Cross multiply
    14,478.45x = 21,720.86 × 8,241.40
  4. Step 4: Simplify right side
    14,478.45x = 179,010,295.60
  5. Step 5: Solve for x
    x = 179,010,295.60/14,478.45
  6. Step 6: Final answer
    x = 12,363.91

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1.5x scale

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.