Home / 12,078.40-18,139.20-8,795.20

Finding the Fourth Proportional to 12,078.40, 18,139.20 and 8,795.20

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Solution

The fourth proportional to 12,078.40, 18,139.20 and 8,795.20 is: 13,208.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,078.40 : 18,139.20 = 8,795.20 : x
  2. Step 2: Convert to fraction form
    12,078.40/18,139.20 = 8,795.20/x
  3. Step 3: Cross multiply
    12,078.40x = 18,139.20 × 8,795.20
  4. Step 4: Simplify right side
    12,078.40x = 159,537,891.84
  5. Step 5: Solve for x
    x = 159,537,891.84/12,078.40
  6. Step 6: Final answer
    x = 13,208.53

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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.