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Finding the Fourth Proportional to 21,379.66, 31,912.92 and 18,854.64

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Solution

The fourth proportional to 21,379.66, 31,912.92 and 18,854.64 is: 28,143.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,379.66 : 31,912.92 = 18,854.64 : x
  2. Step 2: Convert to fraction form
    21,379.66/31,912.92 = 18,854.64/x
  3. Step 3: Cross multiply
    21,379.66x = 31,912.92 × 18,854.64
  4. Step 4: Simplify right side
    21,379.66x = 601,706,617.95
  5. Step 5: Solve for x
    x = 601,706,617.95/21,379.66
  6. Step 6: Final answer
    x = 28,143.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.