Home / 12,109.78-18,166.80-4,318.60

Finding the Fourth Proportional to 12,109.78, 18,166.80 and 4,318.60

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Solution

The fourth proportional to 12,109.78, 18,166.80 and 4,318.60 is: 6,478.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,109.78 : 18,166.80 = 4,318.60 : x
  2. Step 2: Convert to fraction form
    12,109.78/18,166.80 = 4,318.60/x
  3. Step 3: Cross multiply
    12,109.78x = 18,166.80 × 4,318.60
  4. Step 4: Simplify right side
    12,109.78x = 78,455,142.48
  5. Step 5: Solve for x
    x = 78,455,142.48/12,109.78
  6. Step 6: Final answer
    x = 6,478.66

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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.