Home / 20,719.83-28,617.12-13,677.69

Finding the Fourth Proportional to 20,719.83, 28,617.12 and 13,677.69

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Solution

The fourth proportional to 20,719.83, 28,617.12 and 13,677.69 is: 18,890.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.83 : 28,617.12 = 13,677.69 : x
  2. Step 2: Convert to fraction form
    20,719.83/28,617.12 = 13,677.69/x
  3. Step 3: Cross multiply
    20,719.83x = 28,617.12 × 13,677.69
  4. Step 4: Simplify right side
    20,719.83x = 391,416,096.05
  5. Step 5: Solve for x
    x = 391,416,096.05/20,719.83
  6. Step 6: Final answer
    x = 18,890.89

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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.