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Finding the Fourth Proportional to 18,987.92, 28,481.88 and 12,106.16

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Solution

The fourth proportional to 18,987.92, 28,481.88 and 12,106.16 is: 18,159.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.92 : 28,481.88 = 12,106.16 : x
  2. Step 2: Convert to fraction form
    18,987.92/28,481.88 = 12,106.16/x
  3. Step 3: Cross multiply
    18,987.92x = 28,481.88 × 12,106.16
  4. Step 4: Simplify right side
    18,987.92x = 344,806,196.38
  5. Step 5: Solve for x
    x = 344,806,196.38/18,987.92
  6. Step 6: Final answer
    x = 18,159.24

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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.