Home / 9,139.99-12,613.79-5,161.21

Finding the Fourth Proportional to 9,139.99, 12,613.79 and 5,161.21

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Solution

The fourth proportional to 9,139.99, 12,613.79 and 5,161.21 is: 7,122.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,139.99 : 12,613.79 = 5,161.21 : x
  2. Step 2: Convert to fraction form
    9,139.99/12,613.79 = 5,161.21/x
  3. Step 3: Cross multiply
    9,139.99x = 12,613.79 × 5,161.21
  4. Step 4: Simplify right side
    9,139.99x = 65,102,419.09
  5. Step 5: Solve for x
    x = 65,102,419.09/9,139.99
  6. Step 6: Final answer
    x = 7,122.81

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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.