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Finding the Fourth Proportional to 18,874.92, 28,312.64 and 7,188.78

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Solution

The fourth proportional to 18,874.92, 28,312.64 and 7,188.78 is: 10,783.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,874.92 : 28,312.64 = 7,188.78 : x
  2. Step 2: Convert to fraction form
    18,874.92/28,312.64 = 7,188.78/x
  3. Step 3: Cross multiply
    18,874.92x = 28,312.64 × 7,188.78
  4. Step 4: Simplify right side
    18,874.92x = 203,533,340.18
  5. Step 5: Solve for x
    x = 203,533,340.18/18,874.92
  6. Step 6: Final answer
    x = 10,783.27

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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.