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Finding the Fourth Proportional to 18,779.72, 28,163.82 and 12,973.64

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Solution

The fourth proportional to 18,779.72, 28,163.82 and 12,973.64 is: 19,456.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.72 : 28,163.82 = 12,973.64 : x
  2. Step 2: Convert to fraction form
    18,779.72/28,163.82 = 12,973.64/x
  3. Step 3: Cross multiply
    18,779.72x = 28,163.82 × 12,973.64
  4. Step 4: Simplify right side
    18,779.72x = 365,387,261.70
  5. Step 5: Solve for x
    x = 365,387,261.70/18,779.72
  6. Step 6: Final answer
    x = 19,456.48

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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.