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Finding the Fourth Proportional to 18,779.60, 28,127.87 and 12,842.42

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Solution

The fourth proportional to 18,779.60, 28,127.87 and 12,842.42 is: 19,235.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.60 : 28,127.87 = 12,842.42 : x
  2. Step 2: Convert to fraction form
    18,779.60/28,127.87 = 12,842.42/x
  3. Step 3: Cross multiply
    18,779.60x = 28,127.87 × 12,842.42
  4. Step 4: Simplify right side
    18,779.60x = 361,229,835.79
  5. Step 5: Solve for x
    x = 361,229,835.79/18,779.60
  6. Step 6: Final answer
    x = 19,235.23

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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.