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Finding the Fourth Proportional to 13,479.94, 18,602.36 and 7,815.80

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Solution

The fourth proportional to 13,479.94, 18,602.36 and 7,815.80 is: 10,785.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,479.94 : 18,602.36 = 7,815.80 : x
  2. Step 2: Convert to fraction form
    13,479.94/18,602.36 = 7,815.80/x
  3. Step 3: Cross multiply
    13,479.94x = 18,602.36 × 7,815.80
  4. Step 4: Simplify right side
    13,479.94x = 145,392,325.29
  5. Step 5: Solve for x
    x = 145,392,325.29/13,479.94
  6. Step 6: Final answer
    x = 10,785.83

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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.