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Finding the Fourth Proportional to 12,478.62, 18,859.55 and 12,263.58

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Solution

The fourth proportional to 12,478.62, 18,859.55 and 12,263.58 is: 18,534.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.62 : 18,859.55 = 12,263.58 : x
  2. Step 2: Convert to fraction form
    12,478.62/18,859.55 = 12,263.58/x
  3. Step 3: Cross multiply
    12,478.62x = 18,859.55 × 12,263.58
  4. Step 4: Simplify right side
    12,478.62x = 231,285,538.87
  5. Step 5: Solve for x
    x = 231,285,538.87/12,478.62
  6. Step 6: Final answer
    x = 18,534.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.