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Finding the Fourth Proportional to 18,779.88, 28,169.08 and 4,739.72

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Solution

The fourth proportional to 18,779.88, 28,169.08 and 4,739.72 is: 7,109.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.88 : 28,169.08 = 4,739.72 : x
  2. Step 2: Convert to fraction form
    18,779.88/28,169.08 = 4,739.72/x
  3. Step 3: Cross multiply
    18,779.88x = 28,169.08 × 4,739.72
  4. Step 4: Simplify right side
    18,779.88x = 133,513,551.86
  5. Step 5: Solve for x
    x = 133,513,551.86/18,779.88
  6. Step 6: Final answer
    x = 7,109.39

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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.