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Finding the Fourth Proportional to 18,979.50, 28,482.21 and 6,667.50

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Solution

The fourth proportional to 18,979.50, 28,482.21 and 6,667.50 is: 10,005.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.50 : 28,482.21 = 6,667.50 : x
  2. Step 2: Convert to fraction form
    18,979.50/28,482.21 = 6,667.50/x
  3. Step 3: Cross multiply
    18,979.50x = 28,482.21 × 6,667.50
  4. Step 4: Simplify right side
    18,979.50x = 189,905,135.18
  5. Step 5: Solve for x
    x = 189,905,135.18/18,979.50
  6. Step 6: Final answer
    x = 10,005.80

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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.