Home / 15,781.46-21,778.49-8,708.09

Finding the Fourth Proportional to 15,781.46, 21,778.49 and 8,708.09

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Solution

The fourth proportional to 15,781.46, 21,778.49 and 8,708.09 is: 12,017.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.46 : 21,778.49 = 8,708.09 : x
  2. Step 2: Convert to fraction form
    15,781.46/21,778.49 = 8,708.09/x
  3. Step 3: Cross multiply
    15,781.46x = 21,778.49 × 8,708.09
  4. Step 4: Simplify right side
    15,781.46x = 189,649,050.98
  5. Step 5: Solve for x
    x = 189,649,050.98/15,781.46
  6. Step 6: Final answer
    x = 12,017.21

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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.