Home / 13,642.80-20,431.32-7,781.64

Finding the Fourth Proportional to 13,642.80, 20,431.32 and 7,781.64

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Solution

The fourth proportional to 13,642.80, 20,431.32 and 7,781.64 is: 11,653.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,642.80 : 20,431.32 = 7,781.64 : x
  2. Step 2: Convert to fraction form
    13,642.80/20,431.32 = 7,781.64/x
  3. Step 3: Cross multiply
    13,642.80x = 20,431.32 × 7,781.64
  4. Step 4: Simplify right side
    13,642.80x = 158,989,176.96
  5. Step 5: Solve for x
    x = 158,989,176.96/13,642.80
  6. Step 6: Final answer
    x = 11,653.71

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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.