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Finding the Fourth Proportional to 18,905.80, 28,389.42 and 9,689.80

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Solution

The fourth proportional to 18,905.80, 28,389.42 and 9,689.80 is: 14,550.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.80 : 28,389.42 = 9,689.80 : x
  2. Step 2: Convert to fraction form
    18,905.80/28,389.42 = 9,689.80/x
  3. Step 3: Cross multiply
    18,905.80x = 28,389.42 × 9,689.80
  4. Step 4: Simplify right side
    18,905.80x = 275,087,801.92
  5. Step 5: Solve for x
    x = 275,087,801.92/18,905.80
  6. Step 6: Final answer
    x = 14,550.44

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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.