Home / 12,128.12-18,187.86-4,228.60

Finding the Fourth Proportional to 12,128.12, 18,187.86 and 4,228.60

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Solution

The fourth proportional to 12,128.12, 18,187.86 and 4,228.60 is: 6,341.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.12 : 18,187.86 = 4,228.60 : x
  2. Step 2: Convert to fraction form
    12,128.12/18,187.86 = 4,228.60/x
  3. Step 3: Cross multiply
    12,128.12x = 18,187.86 × 4,228.60
  4. Step 4: Simplify right side
    12,128.12x = 76,909,184.80
  5. Step 5: Solve for x
    x = 76,909,184.80/12,128.12
  6. Step 6: Final answer
    x = 6,341.39

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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.