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Finding the Fourth Proportional to 19,888.70, 29,895.04 and 12,540.38

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Solution

The fourth proportional to 19,888.70, 29,895.04 and 12,540.38 is: 18,849.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,888.70 : 29,895.04 = 12,540.38 : x
  2. Step 2: Convert to fraction form
    19,888.70/29,895.04 = 12,540.38/x
  3. Step 3: Cross multiply
    19,888.70x = 29,895.04 × 12,540.38
  4. Step 4: Simplify right side
    19,888.70x = 374,895,161.72
  5. Step 5: Solve for x
    x = 374,895,161.72/19,888.70
  6. Step 6: Final answer
    x = 18,849.66

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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.