Home / 20,455.10-30,682.65-11,123.90

Finding the Fourth Proportional to 20,455.10, 30,682.65 and 11,123.90

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Solution

The fourth proportional to 20,455.10, 30,682.65 and 11,123.90 is: 16,685.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,455.10 : 30,682.65 = 11,123.90 : x
  2. Step 2: Convert to fraction form
    20,455.10/30,682.65 = 11,123.90/x
  3. Step 3: Cross multiply
    20,455.10x = 30,682.65 × 11,123.90
  4. Step 4: Simplify right side
    20,455.10x = 341,310,730.34
  5. Step 5: Solve for x
    x = 341,310,730.34/20,455.10
  6. Step 6: Final answer
    x = 16,685.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.