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Finding the Fourth Proportional to 18,913.56, 28,357.18 and 8,377.86

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Solution

The fourth proportional to 18,913.56, 28,357.18 and 8,377.86 is: 12,560.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.56 : 28,357.18 = 8,377.86 : x
  2. Step 2: Convert to fraction form
    18,913.56/28,357.18 = 8,377.86/x
  3. Step 3: Cross multiply
    18,913.56x = 28,357.18 × 8,377.86
  4. Step 4: Simplify right side
    18,913.56x = 237,572,484.03
  5. Step 5: Solve for x
    x = 237,572,484.03/18,913.56
  6. Step 6: Final answer
    x = 12,560.96

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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.