Home / 12,979.54-17,919.93-8,509.78

Finding the Fourth Proportional to 12,979.54, 17,919.93 and 8,509.78

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Solution

The fourth proportional to 12,979.54, 17,919.93 and 8,509.78 is: 11,748.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.54 : 17,919.93 = 8,509.78 : x
  2. Step 2: Convert to fraction form
    12,979.54/17,919.93 = 8,509.78/x
  3. Step 3: Cross multiply
    12,979.54x = 17,919.93 × 8,509.78
  4. Step 4: Simplify right side
    12,979.54x = 152,494,661.92
  5. Step 5: Solve for x
    x = 152,494,661.92/12,979.54
  6. Step 6: Final answer
    x = 11,748.85

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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.