Home / 20,431.39-28,176.60-13,253.80

Finding the Fourth Proportional to 20,431.39, 28,176.60 and 13,253.80

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Solution

The fourth proportional to 20,431.39, 28,176.60 and 13,253.80 is: 18,278.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.39 : 28,176.60 = 13,253.80 : x
  2. Step 2: Convert to fraction form
    20,431.39/28,176.60 = 13,253.80/x
  3. Step 3: Cross multiply
    20,431.39x = 28,176.60 × 13,253.80
  4. Step 4: Simplify right side
    20,431.39x = 373,447,021.08
  5. Step 5: Solve for x
    x = 373,447,021.08/20,431.39
  6. Step 6: Final answer
    x = 18,278.10

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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.