Home / 12,005.78-18,008.59-3,121.14

Finding the Fourth Proportional to 12,005.78, 18,008.59 and 3,121.14

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Solution

The fourth proportional to 12,005.78, 18,008.59 and 3,121.14 is: 4,681.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,005.78 : 18,008.59 = 3,121.14 : x
  2. Step 2: Convert to fraction form
    12,005.78/18,008.59 = 3,121.14/x
  3. Step 3: Cross multiply
    12,005.78x = 18,008.59 × 3,121.14
  4. Step 4: Simplify right side
    12,005.78x = 56,207,330.59
  5. Step 5: Solve for x
    x = 56,207,330.59/12,005.78
  6. Step 6: Final answer
    x = 4,681.69

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Similar ratio
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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.