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Finding the Fourth Proportional to 18,641.72, 27,990.12 and 12,440.36

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Solution

The fourth proportional to 18,641.72, 27,990.12 and 12,440.36 is: 18,678.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,641.72 : 27,990.12 = 12,440.36 : x
  2. Step 2: Convert to fraction form
    18,641.72/27,990.12 = 12,440.36/x
  3. Step 3: Cross multiply
    18,641.72x = 27,990.12 × 12,440.36
  4. Step 4: Simplify right side
    18,641.72x = 348,207,169.24
  5. Step 5: Solve for x
    x = 348,207,169.24/18,641.72
  6. Step 6: Final answer
    x = 18,678.92

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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.