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Finding the Fourth Proportional to 13,607.60, 18,780.54 and 8,305.50

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Solution

The fourth proportional to 13,607.60, 18,780.54 and 8,305.50 is: 11,462.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,607.60 : 18,780.54 = 8,305.50 : x
  2. Step 2: Convert to fraction form
    13,607.60/18,780.54 = 8,305.50/x
  3. Step 3: Cross multiply
    13,607.60x = 18,780.54 × 8,305.50
  4. Step 4: Simplify right side
    13,607.60x = 155,981,774.97
  5. Step 5: Solve for x
    x = 155,981,774.97/13,607.60
  6. Step 6: Final answer
    x = 11,462.85

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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.