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Finding the Fourth Proportional to 18,390.80, 27,618.60 and 14,240.90

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Solution

The fourth proportional to 18,390.80, 27,618.60 and 14,240.90 is: 21,386.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390.80 : 27,618.60 = 14,240.90 : x
  2. Step 2: Convert to fraction form
    18,390.80/27,618.60 = 14,240.90/x
  3. Step 3: Cross multiply
    18,390.80x = 27,618.60 × 14,240.90
  4. Step 4: Simplify right side
    18,390.80x = 393,313,720.74
  5. Step 5: Solve for x
    x = 393,313,720.74/18,390.80
  6. Step 6: Final answer
    x = 21,386.44

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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.