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Finding the Fourth Proportional to 18,779.28, 25,919.52 and 12,406.92

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Solution

The fourth proportional to 18,779.28, 25,919.52 and 12,406.92 is: 17,124.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.28 : 25,919.52 = 12,406.92 : x
  2. Step 2: Convert to fraction form
    18,779.28/25,919.52 = 12,406.92/x
  3. Step 3: Cross multiply
    18,779.28x = 25,919.52 × 12,406.92
  4. Step 4: Simplify right side
    18,779.28x = 321,581,411.08
  5. Step 5: Solve for x
    x = 321,581,411.08/18,779.28
  6. Step 6: Final answer
    x = 17,124.27

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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.