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Finding the Fourth Proportional to 18,779.72, 28,164.98 and 8,778.15

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Solution

The fourth proportional to 18,779.72, 28,164.98 and 8,778.15 is: 13,165.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.72 : 28,164.98 = 8,778.15 : x
  2. Step 2: Convert to fraction form
    18,779.72/28,164.98 = 8,778.15/x
  3. Step 3: Cross multiply
    18,779.72x = 28,164.98 × 8,778.15
  4. Step 4: Simplify right side
    18,779.72x = 247,236,419.19
  5. Step 5: Solve for x
    x = 247,236,419.19/18,779.72
  6. Step 6: Final answer
    x = 13,165.07

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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.