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Finding the Fourth Proportional to 13,687.65, 18,900.14 and 8,659.98

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Solution

The fourth proportional to 13,687.65, 18,900.14 and 8,659.98 is: 11,957.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.65 : 18,900.14 = 8,659.98 : x
  2. Step 2: Convert to fraction form
    13,687.65/18,900.14 = 8,659.98/x
  3. Step 3: Cross multiply
    13,687.65x = 18,900.14 × 8,659.98
  4. Step 4: Simplify right side
    13,687.65x = 163,674,791.10
  5. Step 5: Solve for x
    x = 163,674,791.10/13,687.65
  6. Step 6: Final answer
    x = 11,957.84

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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.