Home / 13,720.82-18,924.72-8,685.86

Finding the Fourth Proportional to 13,720.82, 18,924.72 and 8,685.86

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Solution

The fourth proportional to 13,720.82, 18,924.72 and 8,685.86 is: 11,980.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.82 : 18,924.72 = 8,685.86 : x
  2. Step 2: Convert to fraction form
    13,720.82/18,924.72 = 8,685.86/x
  3. Step 3: Cross multiply
    13,720.82x = 18,924.72 × 8,685.86
  4. Step 4: Simplify right side
    13,720.82x = 164,377,468.46
  5. Step 5: Solve for x
    x = 164,377,468.46/13,720.82
  6. Step 6: Final answer
    x = 11,980.15

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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.