Home / 12,489.30-18,678.87-11,112.30

Finding the Fourth Proportional to 12,489.30, 18,678.87 and 11,112.30

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Solution

The fourth proportional to 12,489.30, 18,678.87 and 11,112.30 is: 16,619.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.30 : 18,678.87 = 11,112.30 : x
  2. Step 2: Convert to fraction form
    12,489.30/18,678.87 = 11,112.30/x
  3. Step 3: Cross multiply
    12,489.30x = 18,678.87 × 11,112.30
  4. Step 4: Simplify right side
    12,489.30x = 207,565,207.10
  5. Step 5: Solve for x
    x = 207,565,207.10/12,489.30
  6. Step 6: Final answer
    x = 16,619.44

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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.