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Finding the Fourth Proportional to 18,719.10, 25,779.87 and 18,310.86

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Solution

The fourth proportional to 18,719.10, 25,779.87 and 18,310.86 is: 25,217.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.10 : 25,779.87 = 18,310.86 : x
  2. Step 2: Convert to fraction form
    18,719.10/25,779.87 = 18,310.86/x
  3. Step 3: Cross multiply
    18,719.10x = 25,779.87 × 18,310.86
  4. Step 4: Simplify right side
    18,719.10x = 472,051,590.39
  5. Step 5: Solve for x
    x = 472,051,590.39/18,719.10
  6. Step 6: Final answer
    x = 25,217.64

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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.