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Finding the Fourth Proportional to 13,381.68, 18,489.69 and 12,908.64

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Solution

The fourth proportional to 13,381.68, 18,489.69 and 12,908.64 is: 17,836.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,381.68 : 18,489.69 = 12,908.64 : x
  2. Step 2: Convert to fraction form
    13,381.68/18,489.69 = 12,908.64/x
  3. Step 3: Cross multiply
    13,381.68x = 18,489.69 × 12,908.64
  4. Step 4: Simplify right side
    13,381.68x = 238,676,751.92
  5. Step 5: Solve for x
    x = 238,676,751.92/13,381.68
  6. Step 6: Final answer
    x = 17,836.08

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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.