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Finding the Fourth Proportional to 18,986.74, 28,484.11 and 7,140.62

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Solution

The fourth proportional to 18,986.74, 28,484.11 and 7,140.62 is: 10,712.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.74 : 28,484.11 = 7,140.62 : x
  2. Step 2: Convert to fraction form
    18,986.74/28,484.11 = 7,140.62/x
  3. Step 3: Cross multiply
    18,986.74x = 28,484.11 × 7,140.62
  4. Step 4: Simplify right side
    18,986.74x = 203,394,205.55
  5. Step 5: Solve for x
    x = 203,394,205.55/18,986.74
  6. Step 6: Final answer
    x = 10,712.43

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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.