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Finding the Fourth Proportional to 18,901.92, 28,354.88 and 7,809.44

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Solution

The fourth proportional to 18,901.92, 28,354.88 and 7,809.44 is: 11,714.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,901.92 : 28,354.88 = 7,809.44 : x
  2. Step 2: Convert to fraction form
    18,901.92/28,354.88 = 7,809.44/x
  3. Step 3: Cross multiply
    18,901.92x = 28,354.88 × 7,809.44
  4. Step 4: Simplify right side
    18,901.92x = 221,435,734.07
  5. Step 5: Solve for x
    x = 221,435,734.07/18,901.92
  6. Step 6: Final answer
    x = 11,714.99

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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.