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Finding the Fourth Proportional to 18,779.86, 25,921.38 and 11,231.38

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Solution

The fourth proportional to 18,779.86, 25,921.38 and 11,231.38 is: 15,502.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.86 : 25,921.38 = 11,231.38 : x
  2. Step 2: Convert to fraction form
    18,779.86/25,921.38 = 11,231.38/x
  3. Step 3: Cross multiply
    18,779.86x = 25,921.38 × 11,231.38
  4. Step 4: Simplify right side
    18,779.86x = 291,132,868.90
  5. Step 5: Solve for x
    x = 291,132,868.90/18,779.86
  6. Step 6: Final answer
    x = 15,502.40

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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.