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Finding the Fourth Proportional to 12,783.39, 17,640.94 and 7,118.02

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Solution

The fourth proportional to 12,783.39, 17,640.94 and 7,118.02 is: 9,822.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,783.39 : 17,640.94 = 7,118.02 : x
  2. Step 2: Convert to fraction form
    12,783.39/17,640.94 = 7,118.02/x
  3. Step 3: Cross multiply
    12,783.39x = 17,640.94 × 7,118.02
  4. Step 4: Simplify right side
    12,783.39x = 125,568,563.74
  5. Step 5: Solve for x
    x = 125,568,563.74/12,783.39
  6. Step 6: Final answer
    x = 9,822.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.