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Finding the Fourth Proportional to 21,790.65, 30,061.11 and 14,234.97

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Solution

The fourth proportional to 21,790.65, 30,061.11 and 14,234.97 is: 19,637.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,790.65 : 30,061.11 = 14,234.97 : x
  2. Step 2: Convert to fraction form
    21,790.65/30,061.11 = 14,234.97/x
  3. Step 3: Cross multiply
    21,790.65x = 30,061.11 × 14,234.97
  4. Step 4: Simplify right side
    21,790.65x = 427,918,999.02
  5. Step 5: Solve for x
    x = 427,918,999.02/21,790.65
  6. Step 6: Final answer
    x = 19,637.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.