Home / 13,720.64-18,941.55-8,690.12

Finding the Fourth Proportional to 13,720.64, 18,941.55 and 8,690.12

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Solution

The fourth proportional to 13,720.64, 18,941.55 and 8,690.12 is: 11,996.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.64 : 18,941.55 = 8,690.12 : x
  2. Step 2: Convert to fraction form
    13,720.64/18,941.55 = 8,690.12/x
  3. Step 3: Cross multiply
    13,720.64x = 18,941.55 × 8,690.12
  4. Step 4: Simplify right side
    13,720.64x = 164,604,342.49
  5. Step 5: Solve for x
    x = 164,604,342.49/13,720.64
  6. Step 6: Final answer
    x = 11,996.84

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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.