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Finding the Fourth Proportional to 18,909.85, 28,356.41 and 7,214.89

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Solution

The fourth proportional to 18,909.85, 28,356.41 and 7,214.89 is: 10,819.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.85 : 28,356.41 = 7,214.89 : x
  2. Step 2: Convert to fraction form
    18,909.85/28,356.41 = 7,214.89/x
  3. Step 3: Cross multiply
    18,909.85x = 28,356.41 × 7,214.89
  4. Step 4: Simplify right side
    18,909.85x = 204,588,342.87
  5. Step 5: Solve for x
    x = 204,588,342.87/18,909.85
  6. Step 6: Final answer
    x = 10,819.14

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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.