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Finding the Fourth Proportional to 212,431.91, 318,647.88 and 79,322.57

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Solution

The fourth proportional to 212,431.91, 318,647.88 and 79,322.57 is: 118,983.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,431.91 : 318,647.88 = 79,322.57 : x
  2. Step 2: Convert to fraction form
    212,431.91/318,647.88 = 79,322.57/x
  3. Step 3: Cross multiply
    212,431.91x = 318,647.88 × 79,322.57
  4. Step 4: Simplify right side
    212,431.91x = 25,275,967,173.41
  5. Step 5: Solve for x
    x = 25,275,967,173.41/212,431.91
  6. Step 6: Final answer
    x = 118,983.85

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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.