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Finding the Fourth Proportional to 18,954.45, 28,431.28 and 8,421.62

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Solution

The fourth proportional to 18,954.45, 28,431.28 and 8,421.62 is: 12,632.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,954.45 : 28,431.28 = 8,421.62 : x
  2. Step 2: Convert to fraction form
    18,954.45/28,431.28 = 8,421.62/x
  3. Step 3: Cross multiply
    18,954.45x = 28,431.28 × 8,421.62
  4. Step 4: Simplify right side
    18,954.45x = 239,437,294.12
  5. Step 5: Solve for x
    x = 239,437,294.12/18,954.45
  6. Step 6: Final answer
    x = 12,632.25

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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.