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Finding the Fourth Proportional to 18,871.24, 28,317.42 and 7,786.12

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Solution

The fourth proportional to 18,871.24, 28,317.42 and 7,786.12 is: 11,683.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.24 : 28,317.42 = 7,786.12 : x
  2. Step 2: Convert to fraction form
    18,871.24/28,317.42 = 7,786.12/x
  3. Step 3: Cross multiply
    18,871.24x = 28,317.42 × 7,786.12
  4. Step 4: Simplify right side
    18,871.24x = 220,482,830.21
  5. Step 5: Solve for x
    x = 220,482,830.21/18,871.24
  6. Step 6: Final answer
    x = 11,683.54

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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.