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Finding the Fourth Proportional to 18,390.72, 27,616.62 and 12,425.16

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Solution

The fourth proportional to 18,390.72, 27,616.62 and 12,425.16 is: 18,658.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390.72 : 27,616.62 = 12,425.16 : x
  2. Step 2: Convert to fraction form
    18,390.72/27,616.62 = 12,425.16/x
  3. Step 3: Cross multiply
    18,390.72x = 27,616.62 × 12,425.16
  4. Step 4: Simplify right side
    18,390.72x = 343,140,922.16
  5. Step 5: Solve for x
    x = 343,140,922.16/18,390.72
  6. Step 6: Final answer
    x = 18,658.37

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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.