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Finding the Fourth Proportional to 18,955, 28,434.84 and 8,425

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Solution

The fourth proportional to 18,955, 28,434.84 and 8,425 is: 12,638.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,955 : 28,434.84 = 8,425 : x
  2. Step 2: Convert to fraction form
    18,955/28,434.84 = 8,425/x
  3. Step 3: Cross multiply
    18,955x = 28,434.84 × 8,425
  4. Step 4: Simplify right side
    18,955x = 239,563,527
  5. Step 5: Solve for x
    x = 239,563,527/18,955
  6. Step 6: Final answer
    x = 12,638.54

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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.