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Finding the Fourth Proportional to 13,859.05, 20,784.41 and 7,281.64

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Solution

The fourth proportional to 13,859.05, 20,784.41 and 7,281.64 is: 10,920.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.05 : 20,784.41 = 7,281.64 : x
  2. Step 2: Convert to fraction form
    13,859.05/20,784.41 = 7,281.64/x
  3. Step 3: Cross multiply
    13,859.05x = 20,784.41 × 7,281.64
  4. Step 4: Simplify right side
    13,859.05x = 151,344,554.82
  5. Step 5: Solve for x
    x = 151,344,554.82/13,859.05
  6. Step 6: Final answer
    x = 10,920.27

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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.