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Finding the Fourth Proportional to 212,667.20, 318,975.20 and 87,995.20

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Solution

The fourth proportional to 212,667.20, 318,975.20 and 87,995.20 is: 131,982.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,667.20 : 318,975.20 = 87,995.20 : x
  2. Step 2: Convert to fraction form
    212,667.20/318,975.20 = 87,995.20/x
  3. Step 3: Cross multiply
    212,667.20x = 318,975.20 × 87,995.20
  4. Step 4: Simplify right side
    212,667.20x = 28,068,286,519.04
  5. Step 5: Solve for x
    x = 28,068,286,519.04/212,667.20
  6. Step 6: Final answer
    x = 131,982.21

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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.