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Finding the Fourth Proportional to 18,279.75, 27,419.78 and 4,428.75

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Solution

The fourth proportional to 18,279.75, 27,419.78 and 4,428.75 is: 6,643.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,279.75 : 27,419.78 = 4,428.75 : x
  2. Step 2: Convert to fraction form
    18,279.75/27,419.78 = 4,428.75/x
  3. Step 3: Cross multiply
    18,279.75x = 27,419.78 × 4,428.75
  4. Step 4: Simplify right side
    18,279.75x = 121,435,328.53
  5. Step 5: Solve for x
    x = 121,435,328.53/18,279.75
  6. Step 6: Final answer
    x = 6,643.16

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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.