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Finding the Fourth Proportional to 12,166.80, 18,221.40 and 12,166.80

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Solution

The fourth proportional to 12,166.80, 18,221.40 and 12,166.80 is: 18,221.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,166.80 : 18,221.40 = 12,166.80 : x
  2. Step 2: Convert to fraction form
    12,166.80/18,221.40 = 12,166.80/x
  3. Step 3: Cross multiply
    12,166.80x = 18,221.40 × 12,166.80
  4. Step 4: Simplify right side
    12,166.80x = 221,696,129.52
  5. Step 5: Solve for x
    x = 221,696,129.52/12,166.80
  6. Step 6: Final answer
    x = 18,221.40

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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.