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Finding the Fourth Proportional to 12,656.40, 18,979.92 and 7,393.20

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Solution

The fourth proportional to 12,656.40, 18,979.92 and 7,393.20 is: 11,087.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,656.40 : 18,979.92 = 7,393.20 : x
  2. Step 2: Convert to fraction form
    12,656.40/18,979.92 = 7,393.20/x
  3. Step 3: Cross multiply
    12,656.40x = 18,979.92 × 7,393.20
  4. Step 4: Simplify right side
    12,656.40x = 140,322,344.54
  5. Step 5: Solve for x
    x = 140,322,344.54/12,656.40
  6. Step 6: Final answer
    x = 11,087.07

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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.