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Finding the Fourth Proportional to 12,739.41, 17,578.49 and 7,149.33

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Solution

The fourth proportional to 12,739.41, 17,578.49 and 7,149.33 is: 9,865.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,739.41 : 17,578.49 = 7,149.33 : x
  2. Step 2: Convert to fraction form
    12,739.41/17,578.49 = 7,149.33/x
  3. Step 3: Cross multiply
    12,739.41x = 17,578.49 × 7,149.33
  4. Step 4: Simplify right side
    12,739.41x = 125,674,390.17
  5. Step 5: Solve for x
    x = 125,674,390.17/12,739.41
  6. Step 6: Final answer
    x = 9,865.01

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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.