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Finding the Fourth Proportional to 18,771.50, 28,157.26 and 4,920.50

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Solution

The fourth proportional to 18,771.50, 28,157.26 and 4,920.50 is: 7,380.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,771.50 : 28,157.26 = 4,920.50 : x
  2. Step 2: Convert to fraction form
    18,771.50/28,157.26 = 4,920.50/x
  3. Step 3: Cross multiply
    18,771.50x = 28,157.26 × 4,920.50
  4. Step 4: Simplify right side
    18,771.50x = 138,547,797.83
  5. Step 5: Solve for x
    x = 138,547,797.83/18,771.50
  6. Step 6: Final answer
    x = 7,380.75

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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.