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Finding the Fourth Proportional to 13,709.52, 18,919.13 and 7,421.90

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Solution

The fourth proportional to 13,709.52, 18,919.13 and 7,421.90 is: 10,242.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,709.52 : 18,919.13 = 7,421.90 : x
  2. Step 2: Convert to fraction form
    13,709.52/18,919.13 = 7,421.90/x
  3. Step 3: Cross multiply
    13,709.52x = 18,919.13 × 7,421.90
  4. Step 4: Simplify right side
    13,709.52x = 140,415,759.24
  5. Step 5: Solve for x
    x = 140,415,759.24/13,709.52
  6. Step 6: Final answer
    x = 10,242.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.