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Finding the Fourth Proportional to 12,339.74, 18,509.44 and 2,979.68

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Solution

The fourth proportional to 12,339.74, 18,509.44 and 2,979.68 is: 4,469.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,339.74 : 18,509.44 = 2,979.68 : x
  2. Step 2: Convert to fraction form
    12,339.74/18,509.44 = 2,979.68/x
  3. Step 3: Cross multiply
    12,339.74x = 18,509.44 × 2,979.68
  4. Step 4: Simplify right side
    12,339.74x = 55,152,208.18
  5. Step 5: Solve for x
    x = 55,152,208.18/12,339.74
  6. Step 6: Final answer
    x = 4,469.48

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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.