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Finding the Fourth Proportional to 18,618.90, 27,929.70 and 11,207.40

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Solution

The fourth proportional to 18,618.90, 27,929.70 and 11,207.40 is: 16,811.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,618.90 : 27,929.70 = 11,207.40 : x
  2. Step 2: Convert to fraction form
    18,618.90/27,929.70 = 11,207.40/x
  3. Step 3: Cross multiply
    18,618.90x = 27,929.70 × 11,207.40
  4. Step 4: Simplify right side
    18,618.90x = 313,019,319.78
  5. Step 5: Solve for x
    x = 313,019,319.78/18,618.90
  6. Step 6: Final answer
    x = 16,811.91

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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.