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Finding the Fourth Proportional to 14,139.75, 21,209.64 and 4,905.75

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Solution

The fourth proportional to 14,139.75, 21,209.64 and 4,905.75 is: 7,358.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,139.75 : 21,209.64 = 4,905.75 : x
  2. Step 2: Convert to fraction form
    14,139.75/21,209.64 = 4,905.75/x
  3. Step 3: Cross multiply
    14,139.75x = 21,209.64 × 4,905.75
  4. Step 4: Simplify right side
    14,139.75x = 104,049,191.43
  5. Step 5: Solve for x
    x = 104,049,191.43/14,139.75
  6. Step 6: Final answer
    x = 7,358.63

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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.