Home / 12,078.30-18,117.45-4,287.90

Finding the Fourth Proportional to 12,078.30, 18,117.45 and 4,287.90

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Solution

The fourth proportional to 12,078.30, 18,117.45 and 4,287.90 is: 6,431.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,078.30 : 18,117.45 = 4,287.90 : x
  2. Step 2: Convert to fraction form
    12,078.30/18,117.45 = 4,287.90/x
  3. Step 3: Cross multiply
    12,078.30x = 18,117.45 × 4,287.90
  4. Step 4: Simplify right side
    12,078.30x = 77,685,813.86
  5. Step 5: Solve for x
    x = 77,685,813.86/12,078.30
  6. Step 6: Final answer
    x = 6,431.85

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Similar ratio
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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.