Home / 12,078.40-18,129.76-7,152.96

Finding the Fourth Proportional to 12,078.40, 18,129.76 and 7,152.96

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Solution

The fourth proportional to 12,078.40, 18,129.76 and 7,152.96 is: 10,736.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,078.40 : 18,129.76 = 7,152.96 : x
  2. Step 2: Convert to fraction form
    12,078.40/18,129.76 = 7,152.96/x
  3. Step 3: Cross multiply
    12,078.40x = 18,129.76 × 7,152.96
  4. Step 4: Simplify right side
    12,078.40x = 129,681,448.09
  5. Step 5: Solve for x
    x = 129,681,448.09/12,078.40
  6. Step 6: Final answer
    x = 10,736.64

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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.