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Finding the Fourth Proportional to 18,965.84, 28,456.95 and 7,276.32

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Solution

The fourth proportional to 18,965.84, 28,456.95 and 7,276.32 is: 10,917.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,965.84 : 28,456.95 = 7,276.32 : x
  2. Step 2: Convert to fraction form
    18,965.84/28,456.95 = 7,276.32/x
  3. Step 3: Cross multiply
    18,965.84x = 28,456.95 × 7,276.32
  4. Step 4: Simplify right side
    18,965.84x = 207,061,874.42
  5. Step 5: Solve for x
    x = 207,061,874.42/18,965.84
  6. Step 6: Final answer
    x = 10,917.63

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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.