Home / 12,111.20-18,166.80-8,806.40

Finding the Fourth Proportional to 12,111.20, 18,166.80 and 8,806.40

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Solution

The fourth proportional to 12,111.20, 18,166.80 and 8,806.40 is: 13,209.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,111.20 : 18,166.80 = 8,806.40 : x
  2. Step 2: Convert to fraction form
    12,111.20/18,166.80 = 8,806.40/x
  3. Step 3: Cross multiply
    12,111.20x = 18,166.80 × 8,806.40
  4. Step 4: Simplify right side
    12,111.20x = 159,984,107.52
  5. Step 5: Solve for x
    x = 159,984,107.52/12,111.20
  6. Step 6: Final answer
    x = 13,209.60

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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.