Home / 20,407.68-28,163.04-13,338.72

Finding the Fourth Proportional to 20,407.68, 28,163.04 and 13,338.72

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Solution

The fourth proportional to 20,407.68, 28,163.04 and 13,338.72 is: 18,407.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,407.68 : 28,163.04 = 13,338.72 : x
  2. Step 2: Convert to fraction form
    20,407.68/28,163.04 = 13,338.72/x
  3. Step 3: Cross multiply
    20,407.68x = 28,163.04 × 13,338.72
  4. Step 4: Simplify right side
    20,407.68x = 375,658,904.91
  5. Step 5: Solve for x
    x = 375,658,904.91/20,407.68
  6. Step 6: Final answer
    x = 18,407.72

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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.