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Finding the Fourth Proportional to 18,980.34, 28,404.90 and 11,862.06

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Solution

The fourth proportional to 18,980.34, 28,404.90 and 11,862.06 is: 17,752.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,980.34 : 28,404.90 = 11,862.06 : x
  2. Step 2: Convert to fraction form
    18,980.34/28,404.90 = 11,862.06/x
  3. Step 3: Cross multiply
    18,980.34x = 28,404.90 × 11,862.06
  4. Step 4: Simplify right side
    18,980.34x = 336,940,628.09
  5. Step 5: Solve for x
    x = 336,940,628.09/18,980.34
  6. Step 6: Final answer
    x = 17,752.09

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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.