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Finding the Fourth Proportional to 18,853.31, 28,291.88 and 10,538.78

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Solution

The fourth proportional to 18,853.31, 28,291.88 and 10,538.78 is: 15,814.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,853.31 : 28,291.88 = 10,538.78 : x
  2. Step 2: Convert to fraction form
    18,853.31/28,291.88 = 10,538.78/x
  3. Step 3: Cross multiply
    18,853.31x = 28,291.88 × 10,538.78
  4. Step 4: Simplify right side
    18,853.31x = 298,162,022.71
  5. Step 5: Solve for x
    x = 298,162,022.71/18,853.31
  6. Step 6: Final answer
    x = 15,814.84

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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.