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Finding the Fourth Proportional to 15,751.78, 21,739.86 and 11,968.78

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Solution

The fourth proportional to 15,751.78, 21,739.86 and 11,968.78 is: 16,518.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,751.78 : 21,739.86 = 11,968.78 : x
  2. Step 2: Convert to fraction form
    15,751.78/21,739.86 = 11,968.78/x
  3. Step 3: Cross multiply
    15,751.78x = 21,739.86 × 11,968.78
  4. Step 4: Simplify right side
    15,751.78x = 260,199,601.57
  5. Step 5: Solve for x
    x = 260,199,601.57/15,751.78
  6. Step 6: Final answer
    x = 16,518.74

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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.