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Finding the Fourth Proportional to 212,293.76, 318,342.24 and 79,138.28

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Solution

The fourth proportional to 212,293.76, 318,342.24 and 79,138.28 is: 118,670.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,293.76 : 318,342.24 = 79,138.28 : x
  2. Step 2: Convert to fraction form
    212,293.76/318,342.24 = 79,138.28/x
  3. Step 3: Cross multiply
    212,293.76x = 318,342.24 × 79,138.28
  4. Step 4: Simplify right side
    212,293.76x = 25,193,057,324.95
  5. Step 5: Solve for x
    x = 25,193,057,324.95/212,293.76
  6. Step 6: Final answer
    x = 118,670.74

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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.