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Finding the Fourth Proportional to 12,678.53, 18,994.10 and 10,611.81

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Solution

The fourth proportional to 12,678.53, 18,994.10 and 10,611.81 is: 15,897.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,678.53 : 18,994.10 = 10,611.81 : x
  2. Step 2: Convert to fraction form
    12,678.53/18,994.10 = 10,611.81/x
  3. Step 3: Cross multiply
    12,678.53x = 18,994.10 × 10,611.81
  4. Step 4: Simplify right side
    12,678.53x = 201,561,727.26
  5. Step 5: Solve for x
    x = 201,561,727.26/12,678.53
  6. Step 6: Final answer
    x = 15,897.88

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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.