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Finding the Fourth Proportional to 18,911.78, 28,354.53 and 8,376.06

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Solution

The fourth proportional to 18,911.78, 28,354.53 and 8,376.06 is: 12,558.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.78 : 28,354.53 = 8,376.06 : x
  2. Step 2: Convert to fraction form
    18,911.78/28,354.53 = 8,376.06/x
  3. Step 3: Cross multiply
    18,911.78x = 28,354.53 × 8,376.06
  4. Step 4: Simplify right side
    18,911.78x = 237,499,160.88
  5. Step 5: Solve for x
    x = 237,499,160.88/18,911.78
  6. Step 6: Final answer
    x = 12,558.27

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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.