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Finding the Fourth Proportional to 18,878.94, 28,318.95 and 6,399

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Solution

The fourth proportional to 18,878.94, 28,318.95 and 6,399 is: 9,598.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.94 : 28,318.95 = 6,399 : x
  2. Step 2: Convert to fraction form
    18,878.94/28,318.95 = 6,399/x
  3. Step 3: Cross multiply
    18,878.94x = 28,318.95 × 6,399
  4. Step 4: Simplify right side
    18,878.94x = 181,212,961.05
  5. Step 5: Solve for x
    x = 181,212,961.05/18,878.94
  6. Step 6: Final answer
    x = 9,598.68

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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.