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Finding the Fourth Proportional to 18,775.70, 28,171.90 and 9,888.86

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Solution

The fourth proportional to 18,775.70, 28,171.90 and 9,888.86 is: 14,837.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,775.70 : 28,171.90 = 9,888.86 : x
  2. Step 2: Convert to fraction form
    18,775.70/28,171.90 = 9,888.86/x
  3. Step 3: Cross multiply
    18,775.70x = 28,171.90 × 9,888.86
  4. Step 4: Simplify right side
    18,775.70x = 278,587,975.03
  5. Step 5: Solve for x
    x = 278,587,975.03/18,775.70
  6. Step 6: Final answer
    x = 14,837.69

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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.