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Finding the Fourth Proportional to 13,421.99, 20,132.99 and 3,561.68

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Solution

The fourth proportional to 13,421.99, 20,132.99 and 3,561.68 is: 5,342.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.99 : 20,132.99 = 3,561.68 : x
  2. Step 2: Convert to fraction form
    13,421.99/20,132.99 = 3,561.68/x
  3. Step 3: Cross multiply
    13,421.99x = 20,132.99 × 3,561.68
  4. Step 4: Simplify right side
    13,421.99x = 71,707,267.82
  5. Step 5: Solve for x
    x = 71,707,267.82/13,421.99
  6. Step 6: Final answer
    x = 5,342.52

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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.