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Finding the Fourth Proportional to 15,751.86, 21,717.39 and 12,908.76

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Solution

The fourth proportional to 15,751.86, 21,717.39 and 12,908.76 is: 17,797.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,751.86 : 21,717.39 = 12,908.76 : x
  2. Step 2: Convert to fraction form
    15,751.86/21,717.39 = 12,908.76/x
  3. Step 3: Cross multiply
    15,751.86x = 21,717.39 × 12,908.76
  4. Step 4: Simplify right side
    15,751.86x = 280,344,575.34
  5. Step 5: Solve for x
    x = 280,344,575.34/15,751.86
  6. Step 6: Final answer
    x = 17,797.55

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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.