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Finding the Fourth Proportional to 7,989.76, 11,979.76 and 3,054.16

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Solution

The fourth proportional to 7,989.76, 11,979.76 and 3,054.16 is: 4,579.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,989.76 : 11,979.76 = 3,054.16 : x
  2. Step 2: Convert to fraction form
    7,989.76/11,979.76 = 3,054.16/x
  3. Step 3: Cross multiply
    7,989.76x = 11,979.76 × 3,054.16
  4. Step 4: Simplify right side
    7,989.76x = 36,588,103.80
  5. Step 5: Solve for x
    x = 36,588,103.80/7,989.76
  6. Step 6: Final answer
    x = 4,579.37

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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.