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Finding the Fourth Proportional to 212,558.45, 318,828.45 and 79,439.86

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Solution

The fourth proportional to 212,558.45, 318,828.45 and 79,439.86 is: 119,156.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,558.45 : 318,828.45 = 79,439.86 : x
  2. Step 2: Convert to fraction form
    212,558.45/318,828.45 = 79,439.86/x
  3. Step 3: Cross multiply
    212,558.45x = 318,828.45 × 79,439.86
  4. Step 4: Simplify right side
    212,558.45x = 25,327,687,034.82
  5. Step 5: Solve for x
    x = 25,327,687,034.82/212,558.45
  6. Step 6: Final answer
    x = 119,156.34

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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.