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Finding the Fourth Proportional to 18,780.75, 28,171.13 and 4,929.75

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Solution

The fourth proportional to 18,780.75, 28,171.13 and 4,929.75 is: 7,394.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,780.75 : 28,171.13 = 4,929.75 : x
  2. Step 2: Convert to fraction form
    18,780.75/28,171.13 = 4,929.75/x
  3. Step 3: Cross multiply
    18,780.75x = 28,171.13 × 4,929.75
  4. Step 4: Simplify right side
    18,780.75x = 138,876,603.47
  5. Step 5: Solve for x
    x = 138,876,603.47/18,780.75
  6. Step 6: Final answer
    x = 7,394.63

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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.