Home / 13,451.21-18,561.85-7,785.55

Finding the Fourth Proportional to 13,451.21, 18,561.85 and 7,785.55

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Solution

The fourth proportional to 13,451.21, 18,561.85 and 7,785.55 is: 10,743.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,451.21 : 18,561.85 = 7,785.55 : x
  2. Step 2: Convert to fraction form
    13,451.21/18,561.85 = 7,785.55/x
  3. Step 3: Cross multiply
    13,451.21x = 18,561.85 × 7,785.55
  4. Step 4: Simplify right side
    13,451.21x = 144,514,079.53
  5. Step 5: Solve for x
    x = 144,514,079.53/13,451.21
  6. Step 6: Final answer
    x = 10,743.57

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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.