Home / 20,390.54-28,139.38-14,432.90

Finding the Fourth Proportional to 20,390.54, 28,139.38 and 14,432.90

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Solution

The fourth proportional to 20,390.54, 28,139.38 and 14,432.90 is: 19,917.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.54 : 28,139.38 = 14,432.90 : x
  2. Step 2: Convert to fraction form
    20,390.54/28,139.38 = 14,432.90/x
  3. Step 3: Cross multiply
    20,390.54x = 28,139.38 × 14,432.90
  4. Step 4: Simplify right side
    20,390.54x = 406,132,857.60
  5. Step 5: Solve for x
    x = 406,132,857.60/20,390.54
  6. Step 6: Final answer
    x = 19,917.71

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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.