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Finding the Fourth Proportional to 18,967.78, 28,464.60 and 6,655.78

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Solution

The fourth proportional to 18,967.78, 28,464.60 and 6,655.78 is: 9,988.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,967.78 : 28,464.60 = 6,655.78 : x
  2. Step 2: Convert to fraction form
    18,967.78/28,464.60 = 6,655.78/x
  3. Step 3: Cross multiply
    18,967.78x = 28,464.60 × 6,655.78
  4. Step 4: Simplify right side
    18,967.78x = 189,454,115.39
  5. Step 5: Solve for x
    x = 189,454,115.39/18,967.78
  6. Step 6: Final answer
    x = 9,988.21

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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.