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Finding the Fourth Proportional to 18,967.15, 28,451.94 and 7,278.85

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Solution

The fourth proportional to 18,967.15, 28,451.94 and 7,278.85 is: 10,918.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,967.15 : 28,451.94 = 7,278.85 : x
  2. Step 2: Convert to fraction form
    18,967.15/28,451.94 = 7,278.85/x
  3. Step 3: Cross multiply
    18,967.15x = 28,451.94 × 7,278.85
  4. Step 4: Simplify right side
    18,967.15x = 207,097,403.47
  5. Step 5: Solve for x
    x = 207,097,403.47/18,967.15
  6. Step 6: Final answer
    x = 10,918.74

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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.