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Finding the Fourth Proportional to 18,779.54, 28,169.91 and 8,913.74

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Solution

The fourth proportional to 18,779.54, 28,169.91 and 8,913.74 is: 13,370.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.54 : 28,169.91 = 8,913.74 : x
  2. Step 2: Convert to fraction form
    18,779.54/28,169.91 = 8,913.74/x
  3. Step 3: Cross multiply
    18,779.54x = 28,169.91 × 8,913.74
  4. Step 4: Simplify right side
    18,779.54x = 251,099,112.71
  5. Step 5: Solve for x
    x = 251,099,112.71/18,779.54
  6. Step 6: Final answer
    x = 13,370.89

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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.