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Finding the Fourth Proportional to 12,376.80, 18,608.40 and 12,117.60

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Solution

The fourth proportional to 12,376.80, 18,608.40 and 12,117.60 is: 18,218.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,376.80 : 18,608.40 = 12,117.60 : x
  2. Step 2: Convert to fraction form
    12,376.80/18,608.40 = 12,117.60/x
  3. Step 3: Cross multiply
    12,376.80x = 18,608.40 × 12,117.60
  4. Step 4: Simplify right side
    12,376.80x = 225,489,147.84
  5. Step 5: Solve for x
    x = 225,489,147.84/12,376.80
  6. Step 6: Final answer
    x = 18,218.70

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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.