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Finding the Fourth Proportional to 18,871.86, 28,308.42 and 8,483.64

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Solution

The fourth proportional to 18,871.86, 28,308.42 and 8,483.64 is: 12,725.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.86 : 28,308.42 = 8,483.64 : x
  2. Step 2: Convert to fraction form
    18,871.86/28,308.42 = 8,483.64/x
  3. Step 3: Cross multiply
    18,871.86x = 28,308.42 × 8,483.64
  4. Step 4: Simplify right side
    18,871.86x = 240,158,444.25
  5. Step 5: Solve for x
    x = 240,158,444.25/18,871.86
  6. Step 6: Final answer
    x = 12,725.74

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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.