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Finding the Fourth Proportional to 18,913.66, 28,357.35 and 8,377.94

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Solution

The fourth proportional to 18,913.66, 28,357.35 and 8,377.94 is: 12,561.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.66 : 28,357.35 = 8,377.94 : x
  2. Step 2: Convert to fraction form
    18,913.66/28,357.35 = 8,377.94/x
  3. Step 3: Cross multiply
    18,913.66x = 28,357.35 × 8,377.94
  4. Step 4: Simplify right side
    18,913.66x = 237,576,176.86
  5. Step 5: Solve for x
    x = 237,576,176.86/18,913.66
  6. Step 6: Final answer
    x = 12,561.09

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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.