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Finding the Fourth Proportional to 212,572.94, 318,864.18 and 79,380.54

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Solution

The fourth proportional to 212,572.94, 318,864.18 and 79,380.54 is: 119,072.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,572.94 : 318,864.18 = 79,380.54 : x
  2. Step 2: Convert to fraction form
    212,572.94/318,864.18 = 79,380.54/x
  3. Step 3: Cross multiply
    212,572.94x = 318,864.18 × 79,380.54
  4. Step 4: Simplify right side
    212,572.94x = 25,311,610,795.06
  5. Step 5: Solve for x
    x = 25,311,610,795.06/212,572.94
  6. Step 6: Final answer
    x = 119,072.59

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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.