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Finding the Fourth Proportional to 18,640.12, 25,719.14 and 13,607.08

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Solution

The fourth proportional to 18,640.12, 25,719.14 and 13,607.08 is: 18,774.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,640.12 : 25,719.14 = 13,607.08 : x
  2. Step 2: Convert to fraction form
    18,640.12/25,719.14 = 13,607.08/x
  3. Step 3: Cross multiply
    18,640.12x = 25,719.14 × 13,607.08
  4. Step 4: Simplify right side
    18,640.12x = 349,962,198.88
  5. Step 5: Solve for x
    x = 349,962,198.88/18,640.12
  6. Step 6: Final answer
    x = 18,774.68

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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.