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Finding the Fourth Proportional to 18,909.64, 28,347.99 and 7,809.40

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Solution

The fourth proportional to 18,909.64, 28,347.99 and 7,809.40 is: 11,707.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.64 : 28,347.99 = 7,809.40 : x
  2. Step 2: Convert to fraction form
    18,909.64/28,347.99 = 7,809.40/x
  3. Step 3: Cross multiply
    18,909.64x = 28,347.99 × 7,809.40
  4. Step 4: Simplify right side
    18,909.64x = 221,380,793.11
  5. Step 5: Solve for x
    x = 221,380,793.11/18,909.64
  6. Step 6: Final answer
    x = 11,707.30

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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.