Home / 12,078.20-18,117.30-4,287.80

Finding the Fourth Proportional to 12,078.20, 18,117.30 and 4,287.80

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Solution

The fourth proportional to 12,078.20, 18,117.30 and 4,287.80 is: 6,431.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,078.20 : 18,117.30 = 4,287.80 : x
  2. Step 2: Convert to fraction form
    12,078.20/18,117.30 = 4,287.80/x
  3. Step 3: Cross multiply
    12,078.20x = 18,117.30 × 4,287.80
  4. Step 4: Simplify right side
    12,078.20x = 77,683,358.94
  5. Step 5: Solve for x
    x = 77,683,358.94/12,078.20
  6. Step 6: Final answer
    x = 6,431.70

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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.