Home / 12,135.39-18,159.78-8,807.49

Finding the Fourth Proportional to 12,135.39, 18,159.78 and 8,807.49

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Solution

The fourth proportional to 12,135.39, 18,159.78 and 8,807.49 is: 13,179.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,135.39 : 18,159.78 = 8,807.49 : x
  2. Step 2: Convert to fraction form
    12,135.39/18,159.78 = 8,807.49/x
  3. Step 3: Cross multiply
    12,135.39x = 18,159.78 × 8,807.49
  4. Step 4: Simplify right side
    12,135.39x = 159,942,080.75
  5. Step 5: Solve for x
    x = 159,942,080.75/12,135.39
  6. Step 6: Final answer
    x = 13,179.81

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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.