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Finding the Fourth Proportional to 12,588.72, 18,855.74 and 12,238.80

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Solution

The fourth proportional to 12,588.72, 18,855.74 and 12,238.80 is: 18,331.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,588.72 : 18,855.74 = 12,238.80 : x
  2. Step 2: Convert to fraction form
    12,588.72/18,855.74 = 12,238.80/x
  3. Step 3: Cross multiply
    12,588.72x = 18,855.74 × 12,238.80
  4. Step 4: Simplify right side
    12,588.72x = 230,771,521.76
  5. Step 5: Solve for x
    x = 230,771,521.76/12,588.72
  6. Step 6: Final answer
    x = 18,331.62

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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.