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Finding the Fourth Proportional to 13,607.80, 18,780.80 and 8,305.69

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Solution

The fourth proportional to 13,607.80, 18,780.80 and 8,305.69 is: 11,463.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,607.80 : 18,780.80 = 8,305.69 : x
  2. Step 2: Convert to fraction form
    13,607.80/18,780.80 = 8,305.69/x
  3. Step 3: Cross multiply
    13,607.80x = 18,780.80 × 8,305.69
  4. Step 4: Simplify right side
    13,607.80x = 155,987,449.49
  5. Step 5: Solve for x
    x = 155,987,449.49/13,607.80
  6. Step 6: Final answer
    x = 11,463.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.