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Finding the Fourth Proportional to 12,469.80, 18,661.50 and 11,953.20

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Solution

The fourth proportional to 12,469.80, 18,661.50 and 11,953.20 is: 17,888.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,469.80 : 18,661.50 = 11,953.20 : x
  2. Step 2: Convert to fraction form
    12,469.80/18,661.50 = 11,953.20/x
  3. Step 3: Cross multiply
    12,469.80x = 18,661.50 × 11,953.20
  4. Step 4: Simplify right side
    12,469.80x = 223,064,641.80
  5. Step 5: Solve for x
    x = 223,064,641.80/12,469.80
  6. Step 6: Final answer
    x = 17,888.39

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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.