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Finding the Fourth Proportional to 18,888.86, 28,309.05 and 15,961.79

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Solution

The fourth proportional to 18,888.86, 28,309.05 and 15,961.79 is: 23,922.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,888.86 : 28,309.05 = 15,961.79 : x
  2. Step 2: Convert to fraction form
    18,888.86/28,309.05 = 15,961.79/x
  3. Step 3: Cross multiply
    18,888.86x = 28,309.05 × 15,961.79
  4. Step 4: Simplify right side
    18,888.86x = 451,862,969.65
  5. Step 5: Solve for x
    x = 451,862,969.65/18,888.86
  6. Step 6: Final answer
    x = 23,922.20

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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.