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Finding the Fourth Proportional to 18,866.72, 28,289.22 and 7,781.08

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Solution

The fourth proportional to 18,866.72, 28,289.22 and 7,781.08 is: 11,667.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,866.72 : 28,289.22 = 7,781.08 : x
  2. Step 2: Convert to fraction form
    18,866.72/28,289.22 = 7,781.08/x
  3. Step 3: Cross multiply
    18,866.72x = 28,289.22 × 7,781.08
  4. Step 4: Simplify right side
    18,866.72x = 220,120,683.96
  5. Step 5: Solve for x
    x = 220,120,683.96/18,866.72
  6. Step 6: Final answer
    x = 11,667.14

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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.