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Finding the Fourth Proportional to 18,966.78, 28,463.10 and 6,654.78

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Solution

The fourth proportional to 18,966.78, 28,463.10 and 6,654.78 is: 9,986.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,966.78 : 28,463.10 = 6,654.78 : x
  2. Step 2: Convert to fraction form
    18,966.78/28,463.10 = 6,654.78/x
  3. Step 3: Cross multiply
    18,966.78x = 28,463.10 × 6,654.78
  4. Step 4: Simplify right side
    18,966.78x = 189,415,668.62
  5. Step 5: Solve for x
    x = 189,415,668.62/18,966.78
  6. Step 6: Final answer
    x = 9,986.71

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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.