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Finding the Fourth Proportional to 212,415.92, 318,628.13 and 79,269.64

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Solution

The fourth proportional to 212,415.92, 318,628.13 and 79,269.64 is: 118,906.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,415.92 : 318,628.13 = 79,269.64 : x
  2. Step 2: Convert to fraction form
    212,415.92/318,628.13 = 79,269.64/x
  3. Step 3: Cross multiply
    212,415.92x = 318,628.13 × 79,269.64
  4. Step 4: Simplify right side
    212,415.92x = 25,257,536,411.95
  5. Step 5: Solve for x
    x = 25,257,536,411.95/212,415.92
  6. Step 6: Final answer
    x = 118,906.04

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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.